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Read the following statements. Which ones are correct? Be sure to explain how you know. BF3 and PFs are examples of exceptions to the octet rule. II. BF,¯ and BFg-NH3 are examples of violations of the octet rule. III. Expanded valence shells occur most often when the central atom is bonded to a small, electronegative element. IV. The central atoms most capable of having expanded valence shells come from rows 3, 4, and 5 of the periodic table.

1. How can you tell if a compound is covalent? 2. What distinguishes a covalent bond from an ionic bond? 3. How do you know how many valence electrons an atom has? 4. What is electronegativity? Is electronegativity a property of atoms or bonds? 5. What is polarity? Is polarity a property of atoms or bonds? 6. Describe in detail the N-F bond in terms of the relevant electronegativities and polarities. 7. What does VSEPR stand for and how does it allow one to predict the shapes of covalent molecules?

Write Lewis structures that obey the octet rule for each of the following. a. HCN b. PH3 c. CHCl3 d. NH4+ e. H2CO f. SeF2 g. CO2 h. O2 i. HBr Except for HCN and H2CO, the first atom listed is the central atom. For HCN and H2CO , carbon is the central atom.

Read the following statements. Which ones are correct? Be sure to explain how you know. I. BF3 and PF5 are examples of exceptions to the octet rule. II. BF4¯ and BF3-NH3 are examples of violations of the octet rule. III. Expanded valence shells occur most often when the central atom is bonded to a small, electronegative element. IV. The central atoms most capable of having expanded valence shells come from rows 3, 4, and 5 of the periodic table.

Fill in the lone pairs on each atom to give every main group element except hydrogen an octet.

Help please

ng and lear X G The element in period 5 that has X C Solved The following Lewis diagr. X nt/takeCovalentActivity.do?locator-assignment-take The formal charge is the "charge" an element would have in a molecule or ion if all of the bonding electrons were shared equally between atoms. Formal Charge 01 We can draw three inequivalent Lewis structures for carbon dioxide, CO₂. The concepts of formal charge and electronegativity can help us choose the structure that is the most significant representation. 1. Assign formal charges to the elements in each of the structures below. C [Review Topics] [References] Use the References to access important values if needed for this question. 02 :0₁-C=0₂: A 0,=C=0₂ :0,=C-0₂: + B 999 C *** 2. The structure that contributes most significantly to the overall electronic structure of CO₂ is. AG ENG neme Next 11:52 AM 11/28/2022 [

Please draw the Lewis structure for each of the follow 1). HCN Of all the atoms in HCN, which is the most electronegative? (Where will the electrons spend most of their time?) a) 3). PC13 Most electronegative?

For CIO,OH, write a resonance structure with the octet rule satisfied for the central atom and a second resonance structure that minimizes formal charges. In the one that satisfies the octet rule, which atoms have a formal charge of zero? Select one or more: Da. H a b. CI C. The 3 equilvalent O. d. The O bonded to the H. x x >