Question 1

Magnesium (Mg) has an atomic number of 12. How many core electrons and valence electrons does Mg have, and what is its effective nuclear charge ($$Z_{eff}) $$for a valence electron? Use the formula $$Z_{eff} = Z - S$$, where $$Z is $$the atomic number and $$S is $$the number of core electrons.

Accepted Answer

Core electrons: 10, Valence electrons: 2, $$Z_{eff} = 12 - 10 = 2$$

Question 2

Rank the following ions from smallest to largest atomic radius: $$F^-$$, $$F^+$$, $$F.$$

Accepted Answer

$$F^+$$ \u003c F \u003c $$F^-$$

Question 3

Given the following ionization energies for an unknown element: $$IE_1 = 1$$,086$$ kJ/mol, IE_2$ = 2,352 kJ/$$mol, $$IE_3 = 4$$,629$$ kJ/mol, IE_4$ = 6,221 kJ/$$mol, $$IE_5 = 37$$,820$$ kJ/mol, IE_6$ = 47,260 kJ/$$mol. How many valence electrons does this element have?

Accepted Answer

4

Question 4

Which of the following ions is isoelectronic with $$S^{2-}$$?

Accepted Answer

$$Cl^-$$

Question 5

Arrange the following elements in order from largest to smallest electron affinity: Cl, Br, I.

Accepted Answer

Cl \u003e Br \u003e I

Question 6

What is the correct formula for ammonium sulfide?

Accepted Answer

$$(NH_4$)_2S$$

Question 7

Which of the following is the correct Lewis structure for $$CO ($$carbon monoxide)?

Accepted Answer

A triple bond between C and O, with a lone pair on C and a lone pair on O; formal charges: C (-1), O (+1)

Question 8

How many resonance structures can be drawn for $$SO_2$$?

Accepted Answer

2

Question 9

Which of the following molecules is polar?

Accepted Answer

$$HCN$$

Question 10

What is the molecular geometry and bond angle of $$SF_4$$?

Accepted Answer

See-saw, $$\u003c 120^	ext{o}$$ and $$\u003c 90^	ext{o}$$

Question 11

How many sigma and pi bonds are present in the benzene molecule ($$C_6H_6$$)?

Accepted Answer

12 sigma bonds, 3 pi bonds

Question 12

Which hybridization corresponds to the central atom in $$BeCl_2$$?

Accepted Answer

$$sp$$

Question 13

Which of the following best describes the electron geometry of $$XeO_4$$?

Accepted Answer

Tetrahedral

Question 14

For the molecule $$NH_4$$^+$$, what is the formal charge on the nitrogen atom?

Accepted Answer

0

Question 15

Which of the following molecules has a dipole moment?

Accepted Answer

$$H_2S$$

Question 16

What is the correct name for $$CuSO_4$$?

Accepted Answer

Copper(II) sulfate

Question 17

Which of the following is the correct Lewis structure for $$NO_3$$^-$$ (nitrate ion)?

Accepted Answer

One double bond and two single bonds between N and O, with resonance among the oxygens; each single-bonded O has a -1 formal charge.

Question 18

Which of the following molecules or ions has a linear molecular geometry?

Accepted Answer

$$HCN$$

Question 19

How many resonance structures can be drawn for $$N_3$$^-$$ (azide ion)?

Accepted Answer

2

General Chemistry Study Guide: Periodic Trends, Lewis Structures, Molecular Geometry, and Bonding

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