$$4.23 \times 10$$^{14}$$\ \mathrm{Hz}$$

Question 1

A photon of light has a wavelength of $$710\ \mathrm{nm}. $$What is its frequency? (Speed of light $$c = 3.00 	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

$$4.23 	imes 10$$^{14}$$\ \mathrm{Hz}$$

Question 2

Which of the following electron configurations is possible for an atom in the second period?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 3

Which set of quantum numbers is valid and consistent with the Pauli Exclusion Principle?

Accepted Answer

$$n=2,\ l=1,\ m_l=0,\ m_s=+\frac{1}{2}$$

Question 4

Which electron transition in a hydrogen atom is associated with the largest emission of energy?

Accepted Answer

$$n=2 \rightarrow n=1$$

Question 5

Which of the following statements about the Bohr model is FALSE?

Accepted Answer

Electrons can exist between energy levels.

Question 6

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

Accepted Answer

Ne

Question 7

Which of the following ions has the largest radius?

Accepted Answer

$$\mathrm{F^-}$$

Question 8

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

They contain strong electrostatic attractions between oppositely charged ions.

Question 9

Which of the following molecules has a polar covalent bond?

Accepted Answer

$$\mathrm{HCl}$$

Question 10

Which of the following statements about resonance structures is TRUE?

Accepted Answer

The true structure is an average of all resonance forms.

Question 11

Which of the following sets of quantum numbers is NOT allowed?

Accepted Answer

$$n=2,\ l=2,\ m_l=0,\ m_s=+\frac{1}{2}$$

Question 12

Which of the following elements is most likely to form an ion with a $$2+$$ charge?

Accepted Answer

Mg

Question 13

Which of the following best describes the Heisenberg Uncertainty Principle?

Accepted Answer

It is impossible to know both the exact position and momentum of an electron simultaneously.

Question 14

Which of the following atoms has the most unpaired electrons in its ground state?

Accepted Answer

N

Question 15

Which of the following best explains why metals are good conductors of electricity?

Accepted Answer

They have delocalized electrons that can move freely.

Question 16

Which of the following statements about the quantum mechanical model of the atom is TRUE?

Accepted Answer

Electrons are found in orbitals, which are regions of high probability.

Question 17

Which of the following best explains why fluorine is more electronegative than lithium?

Accepted Answer

Fluorine has a higher effective nuclear charge and a smaller atomic radius.

Question 18

Which of the following best describes the relationship between wavelength and frequency for electromagnetic radiation?

Accepted Answer

As wavelength increases, frequency decreases.

Question 19

Which of the following best explains why the bond energy of $$\mathrm{O=O} is $$less than that of $$\mathrm{N\equiv N}$$?

Accepted Answer

A triple bond is stronger than a double bond due to more shared electrons.

Question 20

Which of the following best describes the effect of increasing the principal quantum number $$n$$ for an electron in a hydrogen atom?

Accepted Answer

The electron is farther from the nucleus and has higher energy.

Quantum Mechanics, Electron Configurations, and Chemical Bonding: Study Guide and Practice Problems

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