Question 1

Which experiment provided evidence for the existence of a small, dense, positively charged nucleus at the center of the atom?

Accepted Answer

The Rutherford gold foil experiment

Question 2

If the frequency of electromagnetic radiation increases, what happens to its wavelength according to the equation $$c = \lambda 
u$$?

Accepted Answer

It becomes shorter

Question 3

An electron in a hydrogen atom drops from the $$n=3 to $$the $$n=2$$ energy level. Which of the following best describes the process?

Accepted Answer

The electron emits a photon and moves to a lower energy state

Question 4

Which statement is NOT a conclusion of the Rutherford gold foil experiment?

Accepted Answer

Alpha particles are scattered by the presence of electrons in the atom

Question 5

According to the Heisenberg uncertainty principle, which pair of properties cannot be simultaneously known with arbitrary precision?

Accepted Answer

Position and momentum

Question 6

How many atomic orbitals does the $$d$$ subshell have?

Accepted Answer

5

Question 7

Which of the following sets of quantum numbers could represent the 31st electron in a neutral atom of Xenon ($$Z=54$$)?

Accepted Answer

$$n=4,\ l=2,\ m_l=2,\ m_s=+\frac{1}{2}$$

Question 8

Why do the 4s orbitals fill before the 3d orbitals in the periodic table?

Accepted Answer

The 4s orbital is lower in energy than the 3d orbital

Question 9

Which principle states that no two electrons in the same atom can have the same set of four quantum numbers?

Accepted Answer

The Pauli exclusion principle

Question 10

Which of the following ions are isoelectronic?

Accepted Answer

$$\mathrm{N}^{3-},\ \mathrm{O}^{2-},\ \mathrm{F}^-,\ \mathrm{Na}^+,\ \mathrm{Mg}^{2+},\ \mathrm{Al}^{3+}$$

Question 11

What is the ground state molecular orbital (M.O.) electron configuration of $$\mathrm{C}_2$$?

Accepted Answer

$$\sigma_{1s}^2\ \sigma_{1s}^*{}^2\ \sigma_{2s}^2\ \sigma_{2s}^*{}^2\ \pi_{2p_x}^2\ \pi_{2p_y}^2$$

Question 12

Which of the following best explains why only valence electrons are used in Lewis dot structures?

Accepted Answer

Core electrons are too low in potential energy to interact

Question 13

How many bonding pairs of electrons are there in the covalent molecule $$\mathrm{SF}_6$$?

Accepted Answer

6

Question 14

How many lone pairs of electrons are there in the covalent molecule $$\mathrm{SF}_6$$?

Accepted Answer

0

Question 15

Based on periodic trends, which atom of group 2 is the smallest?

Accepted Answer

Be

Question 16

Which atom has the greatest electron affinity?

Accepted Answer

F

Question 17

Which of the following best describes the major factor that determines the strength of an ionic bond between two atoms?

Accepted Answer

The product of the charges on the cation and anion

Question 18

Which of the following molecules is paramagnetic according to molecular orbital theory?

Accepted Answer

$$\mathrm{O}_2$$

Question 19

Which of the following atoms has the lowest first ionization energy?

Accepted Answer

K

General Chemistry: Atomic Structure, Bonding, and Periodic Trends Study Guide

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