# Homework #7


## Q1

(10 pts) Using the condensed $$spdf$$ notation with noble-gas-core abbreviation, depict the electron configurations of the following ions and indicate if they are paramagnetic or diamagnetic.

1. $$Na^+$$
2. $$Mn^{2+}$$
3. $$Sb^{3+}$$
4. $$Sb^{5+}$$
5. $$O^{2-}$$

## Q2

(10 pts) For each of the following pairs, indicate the atom that has the larger radius:

1. F or Br
2. Cs or Ba
3. Br or Br-
4. P3- or Cl-
5. S2- or Ca2+

## Q3

(10 pts) Answer the following questions.

1. B has a lower (first) ionization energy than N. Explain the reason by using the word "effective nuclear charge".
2. Be has a higher ionization energy than B. Explain why.

## Q4

(10 pts) Answer the following questions.

1. Which of the following orbitals is better at shielding? 5p or 5f
2. Which of the following can form an acidic oxide? Si or K
3. Which chemical species is a better oxidizing agent? F or I

## Q5

(10 pts) Compare the elements He, Ne, Ar, and Kr. Place the elements in order of increasing melting point and explain why.

## Q6

(10 pts) Arrange the following bonds in order of increasing ionic character:

1. H-Cl
2. C-H
3. H-F
4. F-Rb
5. F-F

## Q7

(20 pts) Draw the plausible Lewis structure for each of the following species.

1. $$H_2S$$
2. $$C_2H_4$$
3. $$C_2H_2$$
4. $$OCN^-$$
5. $$Cl_2SO$$

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