Krf2 shape

Science; Chemistry; Chemistry questions and answers; QUESTION 1 Draw the Lewis Structure for the molecule KrF2. This problem has been solved!

Get four FREE subscriptions included with Chegg Study or Chegg Study Pack, and keep your school days running smoothly. 1. ^ Chegg survey fielded between Sept. 24–Oct 12, 2023 among a random sample of U.S. customers who used Chegg Study or Chegg Study Pack in Q2 2023 and Q3 2023. Respondent base (n=611) among approximately 837K invites.Follow three steps to find OF2 molecular shape and its electron geometry 1. 2 teaspoons of water into the sealable plastic bag. To use the model we will. Electron domain geometry- Trigonal bypyramidal molecular domain- T-shape What is the substance KrF2. Determine the electron geometry and molecular geometry of KrF2 according to VSEPR theory.Learn how to draw the lewis structure of KrF2, a molecule with krypton (Kr) and fluorine (F) atoms, using a simple and easy method. See the steps, images, and formal charge calculations for KrF2 lewis structure.Identify the electron pair geometry and the molecular structure of each of the following molecules or ions:(a) IF6+(b) CF4(c) BF3(d) SiF5−(e) BeCl2OpenStax™ ...For KrF2: Formal charge of Kr in the molecule? Oxidation state of Kr in the molecule? Here's the best way to solve it. Who are the experts? Experts have been vetted by Chegg as specialists in this subject. Expert-verified. View the full answer. Previous question Next question.A krypton difluoride coordination compound — where it acts as a ligand to a bromine atom — has been synthesized and studied.

Taking into account the existence of any lone pairs of electrons, what is the approximate geometry of electron groups surrounding the central Kr atom in KrF2? Here's the best way to solve it. Consider the number of lone pairs and bonding pairs of electrons on the central atom to determine the electron group geometry.Question: Part A Using the VSEPR model, the electron-domain geometry of the central atom in KrF2 is O linear O trigonal planar O tetrahedral O trigonal bipyramidal O octahedral. There are 2 steps to solve this one.An atom with a tetrahedral shape is surrounded by _____ atoms or groups. 4. Match each bond depiction with its correct description. Instructions. 1. Solid line - a bond in the plane of the paper 2. A wedge - a bond in front of the plane of the paper 3. a dashed line - a bond behind the plane of the paper.Draw the shape of a molecule of krypton difluoride (KrF2). Include in your answer any lone pairs of electrons that influence the shape. Name the shape produced by the atoms in a KrF2 molecule and suggest a bond angle. Got another question I worked out KrF2 will have 2 bonding pairs 3 loan pairs would the shape not be trigonal bypriomidal but my ...Check out our 2-day online AS-level Physics Recap Course for AQA and OCR (A) on 1-2nd June. Book now! For each of the exam boards below, there are revision notes, factsheets, questions from past exam papers separated by topic and videos.4. To find the mass % of F in KrF2, we need to divide the total mass of F in the compound by the molar mass of KrF2 and multiply by 100: Mass % of F in KrF2 = (Total mass of F / Molar mass of KrF2) × 100 Step 5/7 5. The total mass of F in KrF2 is the mass of two F atoms: Total mass of F = 2 × 19.00 g/mol = 38.00 g/mol Step 6/7 6.Abstract. Theoretical x-ray-absorption near-edge structure (XANES) and extended x-ray-absorption fine structure (EXAFS) of molecular and crystalline KrF2 and gas-phase FeCl2 have been obtained by using a modified X scattered-wave procedure. EXAFS calculations are made in the single-scattering approximation. Effects of multiple scattering near ...Chemistry questions and answers. Draw the Lewis Structure for KrF2. The central atom has _____ lone pairs. It's geometry is ______. Draw the Lewis Structure for CH3COCH3. The geometry of the Carbon which has Hydrogen attached is ________. The geometry of the Carbon attached to Oxygen is ______. There are _____ sigma bonds and _____ pi bonds.

This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: Determine the shape, ideal bond angle (s), and the direction of any deviation from these angles for each of the following. (b) IF-4 shape ideal bond angle (c) SeOF2 shape ideal bond angle. In a paper [1] a precision study of the Raman spectra of XF 2 molecules (X=Xe,Kr) in nonaqueous HF solutions was carried. The splitting of ν 1 band of XeF 2 on three lines with frequencies ∼470, ∼515 and ∼540 cm −1 was observed. Conclution was drawn that this splitting is connected with the strong XeF 2 — solvent intermolecular interaction. . Determination of the true intermolecular ...Taking into account the existence of any lone pairs of electrons, what is the approximate geometry of electron groups surrounding the central Kr atom in KrF2? Here's the best way to solve it. Consider the number of lone pairs and bonding pairs of electrons on the central atom to determine the electron group geometry.Predicting the Shapes of Molecules . There is no direct relationship between the formula of a compound and the shape of its molecules. The shapes of these molecules can be predicted from their Lewis structures, however, with a model developed about 30 years ago, known as the valence-shell electron-pair repulsion (VSEPR) theory.. The VSEPR theory …

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Structure, properties, spectra, suppliers and links for: Krypton difluoride, KrF2.Hartree-Fock and SV / Hartree-Fock ve SVGeometry Optimization / Geometri OptimizasyonuORCA 4.2.1, https://orcaforum.kofo.mpg.de/app.php/portalAvogadro 1.2.0,...Getting fit is hard enough without having to buy fancy in-home exercise equipment. Health and nutrition web site SimpleFit is loaded with info on how to eat right, lose weight, and...A step-by-step explanation of how to draw the CFCl3 Lewis Dot Structure.For the CFCl3 structure use the periodic table to find the total number of valence el...The crystal structures of α-KrF2 and salts containing the KrF+ and Kr2F3+ cations have been investigated for the first time using low-temperature single-crystal X-ray diffraction. The low-temperature α-phase of KrF2 crystallizes in the tetragonal space group I4/mmm with a = 4.1790(6) Å, c = 6.489(1) Å, Z = 2, V = 113.32(3) Å3, R1 = 0.0231, and wR2 = 0.0534 at −125 °C. The [KrF][MF6] (M ...The colorless solid decomposes at room temperature, but it can be stored indefinitely at –78 ºC. KrF 2 is an extremely strong oxidizing and fluorinating agent. It can convert metallic gold to AuF 5, metallic silver to AgF 3, and xenon to XeF 6. It can also oxidize chlorine and bromine to their +5 oxidation states.

KRF2-500 KRF2-1000 m2 80 160 502.65 1005.31 20 25 23 6130 1760 625 179 KRF2.5-500 KRF2.5-1000 m2.5 64 128 502.65 1005.31 25 30 27.5 9580 2810 977 287 KRF3-500 KRF3-1000 m3 53 106 499.51 999.03 30 35 32 13800 4120 1410 421 KRF4-500 KRF4-1000 m4 40 80 502.65 1005.31 40 45 41 24500 7530 2500 768 KRF5-500 KRF5-1000 m5 32 64 502.65 1005.31 50 50 45 ...Polar substances (KrF2, SF2, SO2, CO2, and CH2O) dissolve better in water while a nonpolar substance (H2C-CH2) will dissolve more readily in nonpolar solvents like carbon tetrachloride. Explanation: The solubility of a substance can be predicted through the simple rule of 'like dissolves like'. It means that polar substances will dissolve more ...Steps of drawing KrF4 lewis structure Step 1: Find the total valence electrons in KrF4 molecule. In order to find the total valence electrons in KrF4 molecule, first of all you should know the valence electrons present in krypton atom as well as fluorine atom. (Valence electrons are the electrons that are present in the outermost orbit of any atom.). Here, I'll tell you how you can easily ...Krypton difluoride is tetragonal, space group P42/ mnm, with two linear molecules per unit cell aligned in planes perpendicular to the tetrad axes. The alignment alternates by 90 degrees between successive planes. The kryptonfluorine bond distance is 1.89 0.02 angstroms.The lewis structure of AsF5 has 5 bonding pairs and 15 nonbonding pairs. AsF5 is a nonpolar molecule because of symmetrical geometry that makes the net dipole moment zero. The hybridization of AsF5 is Sp 3 d as its central atom steric number is 5.Complete Table 2 by drawing the shapes of both the AsF5 and KrF2 molecules, showing all lone pairs of electrons that influence the shape. Deduce the bond angle(s) in AsF5. bond 90 and 120 mark scheme. Define the term electronegativity.Using VSEPR, explain why OF2 is bent while KrF2 is linear. Submitted by Peter C. Feb. 24, 2022 04:19 a.m. Feb. 24, 2022 04:19 a.m.Learn to determine if OF2 (Oxygen difluoride) is polar or non-polar based on the Lewis Structure and the molecular geometry (shape).We start with the Lewis S...SeF2 is a chemical formula for selenium diflouride. It consists of one selenium atom and two flourine atoms. To understand its polarity we will first look at...

Geometry of Molecules. Molecular geometry, also known as the molecular structure, is the three-dimensional structure or arrangement of atoms in a molecule. Understanding the molecular structure of a compound can help determine the polarity, reactivity, phase of matter, color, magnetism, as well as the biological activity.

How VSEPR works. In a molecule EX n, the valence shell electron pair around the central atom E and the E-X single bonds are very important due to the repulsion in which determine the shape of the molecule.The repulsions decrease in order of: lone pair-lone pair, lone pair-bonding pair, bonding pair-bonding pair. At the same time, the repulsion would decrease in order of: triple bond-single ...Draw the shape of a molecule of krypton difluoride (KrF2). Include in your answer any lone pairs of electrons that influence the shape. Name the shape produced by the atoms in a KrF2 molecule and suggest a bond angle.KrF2 is Cyanogen Chloride-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is zero-dimensional and consists of two KrF2 clusters. Kr is …The true structure is a combination of all the resonance structures which we refer to as the resonance hybrid. A second question arises, do the constituent resonance structures contribute equally to the resonance hybrid? The answer is, no, certain resonance hybrid contribute to the molecule's structure to a greater degree than others.Question: Draw the Lewis structure of KrF4, then answer the following questions. The electron group geometry of KrF4 is - A. trigonal bipyramid B. seesaw or sawhorse C. T-shape D. octahedral E.square pyramid F. square planar. The molecular shape of KrF4 is -- A. trigonal bipyramid B. seesaw or sawhorse C. T-shape D. octahedral E.The results are further highlighted by electronic band structure calculations which show similar features of equal band gaps of 3 eV in both α-and β-KrF2 and a reorganization of frontier ...Step 1: Figure out how many electrons the molecule must have, based on the number of valence electrons in each atom. When drawing the structure of an ion, be sure to add/subtract electrons to account for the charge. Step 2: Connect the atoms to each other with single bonds to form a “skeleton structure.”.

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Kirkland nativity.

There are five basic shapes that you have to know, and all other shapes are based on these. number of electron pairs* 2 pairs 3 pairs 4 pairs 5 pairs 6 pairs shape AA Q name of shape linear trigonal planar tetrahedral trigonal bipyramidal octahedral bond angle 180º 120º 109.5º 120º, 90º 90º2. The carbon atom forms two double bonds. Each double bond is a group, so there are two electron groups around the central atom. Like BeH 2, the arrangement that minimizes repulsions places the groups 180° apart. 3. Once again, both groups around the central atom are bonding pairs (BP), so CO 2 is designated as AX 2.A step-by-step explanation of how to draw the KrF2 Lewis Dot Structure (Krypton Difluoride).For the KrF2 structure use the periodic table to find the total n...C2H4 Lewis Structure, Molecular Structure, Hybridization, Bond Angle and Shape. The chemical formula C2H4 represents Ethylene. This molecule is also represented by H2C=CH2, clearly showing the alkene nature of the compound. An alkene is a hydrocarbon with a Carbon-Carbon double bond. C2H4 exists as a colorless gas and is flammable.AQAThe valence shell electron-pair repulsion (VSEPR) model is used to predict the shapes of molecules and polyatomic ions. VSEPR is based on the idea that the "groups" or "clouds" of electrons surrounding an atom will adopt an arrangement that minimizes the repulsions between them. In this video, we look at examples of molecules in which ... KrF2 is Cyanogen Chloride-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is zero-dimensional and consists of two KrF2 clusters. Kr is bonded in a linear geometry to two equivalent F atoms. Both Kr–F bond lengths are 1.94 Å. KrF2 is Cyanogen Chloride-derived structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is zero-dimensional and consists of two KrF2 clusters. Kr is bonded in a linear geometry to two equivalent F atoms. Both Kr–F bond lengths are 1.94 Å. F is bonded in a single-bond geometry to one Kr atom. A step-by-step explanation of how to draw the PF4 + Lewis Dot Structure.For the PF4 + structure use the periodic table to find the total number of valence el... ….

What is the shape of each molecule below? Select the correct answer. Answers can be used more than once. -KrF4 -SF4 -SeCl6 -AsF5 -XeCl2 -ICl5 -IF3 OPTIONS: linear bent/v-shape trigonal planar trigonal pyramidal tetrahedral trigonal bipyramidal see-saw T-shape octahedral square pyramidal square planar.The information on this page is fact-checked. Lewis structure of KrF 2 | Image: Root Memory. The Lewis structure of KrF2 contains two single bonds, with krypton in the center, and two fluorines on either side. There are three lone pairs on each atom. KrF2 Lewis Structure: How to Draw the Lewis Structure for KrF2 (Krypton Difluoride) Watch on.DALTON CHEMISTRY O O 9 9 This question is about compounds containing fluorine. Draw the shape of a molecule of krypton difluoride (KrF2). Include in your answer any lone …Study with Quizlet and memorize flashcards containing terms like This question is about compounds containing fluorine. 0 9 . 1 Draw the shape of a molecule of krypton difluoride (KrF2). Include in your answer any lone pairs of electrons that influence the shape. Name the shape produced by the atoms in a KrF2 molecule and suggest a bond angle., There are two lone pairs of electrons on the ...Draw the shape of AsF5 and hence deduce the bond angles. 120, 90. Draw the shape of KrF2. Define the term electronegativity. An atom's ability to attract an electron pair in a covalent bond. The C-Br bond is polar. Explain why CBr4 is not a polar molecule. It is symmetrical so the dipoles cancel out.The crystal structures of α-KrF2 and salts containing the KrF+ and Kr2F3+ cations have been investigated for the first time using low-temperature single-crystal X-ray diffraction. The low-temperature α-phase of KrF2 crystallizes in the tetragonal space group I4/mmm with a = 4.1790(6) Å, c = 6.489(1) Å, Z = 2, V = 113.32(3) Å3, R1 = 0.0231, and wR2 = 0.0534 at −125 °C. The [KrF][MF6] (M ...DALTON CHEMISTRY O O 9 9 This question is about compounds containing fluorine. Draw the shape of a molecule of krypton difluoride (KrF2). Include in your answer any lone …In the Lewis structure of IF5, there are five fluorines connected with a single bond surrounding the central atom I. The iodine atom carries one lone pair and five fluorine atoms carry three lone pairs. Iodine pentafluoride is a square pyramidal geometry and the hybridization is sp3d2. The IF5 is an interhalogen compound.Table 1.1 Basic VSEPR Shapes. Notes: . For VSEPR purpose, the terms "shape" and "geometry" are interchangeable; "electron pair" and "electron group" are also interchangeable. Multiple bonds (double or triple bond) are regarded as one electron group for VSEPR purpose.; For species that do not have any lone pair electrons (LP), the geometry (shape) of the species is just the same ...The shape ( ) of molecules influences physical and chemical properties, including melting point, boiling point, and reactivity. Shape is particularly important in biological systems where, for example, a molecule must fit precisely into the active site of an enzyme. VALENCE SHELL ELECTRON PAIR REPULSION (VSEPR) theory can be used to predict ... Krf2 shape, Fourier transform infrared spectra of KrF2, XeF2, and monoisotopic 136XeF2 have been recorded in the ν3 and ν1+ν3 ranges with an effective resolution of 0.003–0.007 cm−1. About 10 000 rovibrational lines belonging to cold bands and to hot bands with ν1, ν2, 2ν2, and ν3 as lower levels have been assigned and fitted. The high‐resolution results …, VIDEO ANSWER: Everyone in this question is welcome. The first one they were given was iron 4, so they are going to study the total valence electrons of the given species. The peg indicates the parental geometry. The parental geometry of the species, Procedure. Complete the following for each of the molecules and ions on your Report form: Draw Lewis structures, including all resonance structures if applicable (1).Build models and then draw perspective structures (2) that accurately represent bond angles and molecular shapes.The molecular model kits contain different colored balls and different size stick …, Sep 22, 2021 · VSEPR Theory. The VSEPR ( V alence S hell E lectron P air R epulsion) model is used to predict the geometry of molecules based on the number of effective electron pairs around a central atom. The main postulate for the VSEPR theory is that the geometrical structure around a given atom is principally determined by minimizing the repulsion ... , Steps of drawing KrF4 lewis structure Step 1: Find the total valence electrons in KrF4 molecule. In order to find the total valence electrons in KrF4 molecule, first of all you should know the valence electrons present in krypton atom as well as fluorine atom. (Valence electrons are the electrons that are present in the outermost orbit of any atom.). Here, I'll tell you how you can easily ..., A discussion thread about the shape and bond angle of KrF2 (krypton difluoride) molecule. Users share their confusion and insights on the topic, and get some …, Krypton difluoride. Formula: F 2 Kr. Molecular weight: 121.795. CAS Registry Number: 13773-81-4. Information on this page: Vibrational and/or electronic energy levels. References. Notes. Other data available:, Strong emission has been observed in the reaction of KrF2 with SiH4. The emission spectra have been identified to be the B2∑ → X2∑ transition of KrF. The dependence of the spectral shape of the emission has been examined as a function of argon pressure. The pressure dependence of the spectral shape appears to be due to vibrational relaxation in the B2∑ state., Chemistry questions and answers. Question 4 2 pts In the Lewis Structure for BrF2, what is the formal charge for: Br = [ Select] each F = [ Select ] Question 5 4 pts Determine the molecular shape (or geometry) for the following Lewis Structures: NO2 = [Select] BrF4+ = [ Select] IBr4 = [Select ] KrF2 = [ Select ], VIDEO ANSWER: Everyone in this question is welcome. The first one they were given was iron 4, so they are going to study the total valence electrons of the given species. The peg indicates the parental geometry. The parental geometry of the species, Explain why Xe, and to a limited extent Kr, form compounds whereas He, Ne, and Argon do not. Draw out the Lewis structure, predict the shape, bond angle, & hybridization for the following compounds: Here's the best way to solve it. Identify the number of valence electrons in Kr for constructing the Lewis structure of KrF2., Chemical Bonding in XeF2, XeF4, KrF2, KrF4, RnF2, XeCl2, and XeBr2: From the Gas Phase to the Solid State. The Journal of Physical Chemistry A 1998 , 102 (52) , 10647-10654., Bromine trifluoride is a fluoride of bromine. It is also a potent fluorinating agent and an ionizing inorganic solvent. Bromine trifluoride is used to produce uranium hexafluoride in the processing and reprocessing of nuclear fuel. Bromine is a halogen element with the symbol Br and atomic number 35., The shapes of the first five atomic orbitals: 1s, 2s, 2p x, 2p y, and 2p z. The colors denote the sign of the wave function. Orbital hybridization involves making linear combinations of the atomic orbitals that are solutions to the Schrödinger equation., 17. KrF2 18. PO 16. Aslat . F - TF_F: K- TE Draw two valid Lewis Dot structures for each of the following (= resonance forms) then choose the best one by considering formal charges. If both resonance forms are equally favorable, write "equally favorable." The skeletal structure must be the same in both forms!, Feb 28, 2017. Here is what I get for ICl- 4 and KrF2. Explanation: ICl- 4. The Lewis structure of ICl- 4 is. The central atom has 2 lone pairs and 4 bond pairs. Thus, the steric number (SN) is 6, and the electron geometry is octahedral. The lone pairs will arrange themselves at 180° to each other., Get four FREE subscriptions included with Chegg Study or Chegg Study Pack, and keep your school days running smoothly. 1. ^ Chegg survey fielded between Sept. 24–Oct 12, 2023 among a random sample of U.S. customers who used Chegg Study or Chegg Study Pack in Q2 2023 and Q3 2023. Respondent base (n=611) among approximately 837K invites., Is the molecule KrF2 non-polar or polar? Is the molecule KrF2 non-polar or polar? BUY. Chemistry & Chemical Reactivity. 9th Edition. ISBN: 9781133949640. Author: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel. ... KrF4, and Sef4 molecules have similar formulas, but each has a different shape. Draw Lewis…, This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: 14. Determine the shape, ideal bond angle (s), and the direction of any deviation from these angles for each of the following: (a) CIO₂ (b) PFS (c) SeF4 (d) KrF₂. 14., Chemistry questions and answers. This question has multiple parts. Work all the parts to get the most points. Predict the molecular structure and bond angles for XeCl2. Approximate bond angles are sufficient. Molecular Structure % Bond Angles b Predict the molecular structure and bond angles for KrE2. Approximate bond angles are sufficient., Orbital hybridisation. In chemistry, orbital hybridisation (or hybridization) is the concept of mixing atomic orbitals to form new hybrid orbitals (with different energies, shapes, etc., than the component atomic orbitals) suitable for the pairing of electrons to form chemical bonds in valence bond theory. For example, in a carbon atom which ..., The three hybridized sp 2 orbitals are usually arranged in a triangular shape. BF 3 molecule is formed by bonding between three sp 2 orbitals of B and p of 3 F atoms. All the bonds in BF 3 are sigma bonds. BF 3 Molecular Geometry and Bond Angles. Normally, boron forms monomeric covalent halides which have a planar triangular geometry., Learn how to draw the Lewis structure of KrF2, a colorless solid with 3 lone pairs on Kr, and how to find its hybridization, molecular geometry, and polarity. KrF2 is a highly volatile and thermally unstable compound that reacts vigorously with Lewis acids., The shape of SeF₄ is trigonal bipyramidal, ideal bond angle is 120. What is the explanation? 1 Se + 4 F = 6 + 4×7 = 34 valence electrons. Se must expand its octet. This gives Se four bond pairs and one lone pair. The Lewis structure is like that of SeF₄. The electron arrangement for five electron pairs is trigonal bipyramidal., To draw the Lewis dot structure, write the symbol for krypton, Kr, and then place two dots on the top, bottom, and two sides, for a total of eight electrons. ... KrF2 3d valence shell Linear F--Kr ..., Question: Using the VSEPR model, predict the electron domain geometry and the molecular geometry of each species (bent, linear, octahedral, seesaw, square planar, square pyramidal, T-shaped, tetrahedral, trigonal bipyramidal, trigonal planar, or trigonal pyramidal). Part 1 of 4 PF5 Electron Domain Geometry: (Choose one) Molecular …, A hydrogen-like ion is an ion containing only one electron. The energies of the electron in a hydrogen-like ion are given by. En=−(2.180*10^−18)J Z^2 (1/n^2) where n is the principal quantum number, and Z is the atomic number of the element.Calculate the ionization energy, in kJ/mol, of the B^4+ ion., Aug 16, 2013 · A step-by-step explanation of how to draw the KrF2 Lewis Dot Structure (Krypton Difluoride). For the KrF2 structure use the periodic table to find the total number of valence electrons for the... , In explanation of the molecular geometry for the KrF2 (Krypton difluoride) including a description of the KrF2 bond angles. The electron geometry for the Kry..., That nightclub krf2 lewis structure is an old nightclub more than 20 years ago. Later, it was demolished once in the middle, and then renovated, and now it has become an entertainment venue. Shaking his head. Then tell me, where is the misunderstanding Looking premature ejaculation pills cvs at her, I wanted to hear her explanation., The orbitals and their energies as calculated by WebMO are presented below (Table 2.7.3.4 2.7.3. 4 ). Overall our MO diagram looks pretty good. We see that the bonding a 1 orbital is approximately 5 eV lower in energy than the carbon a 1 orbital. The a 1 * orbital is almost 40 eV higher in energy than the a 1 LGO., Shapes of molecules quiz. Footprints-Science have created thousands of resources for teaching and learning science. This website includes free science animations, interactive quizzes, anagrams, flashcards and more., KrF2; Question: According to VSEPR theory, which one of the following molecules should be bent (nonlinear)?a. CO2b. C2H2c. SO2d. BeCl2e. KrF2. According to VSEPR theory, which one of the following molecules should be bent (nonlinear)? a. CO2 b. C2H2 c. SO2 d. BeCl2 e. KrF2. This question hasn't been solved yet!