Question 1

Which set of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

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

Question 2

Which of the following elements has the highest first ionization energy?

Accepted Answer

Neon ($$Ne)$$

Question 3

Given the Rydberg equation $$\frac{1}{\lambda} = R \left( \frac{1}{n_1$^2} - \frac{1}{n_2$^2} ight)$$, what is the wavelength of light emitted when an electron in a hydrogen atom transitions from $$n_2 = 3$ to n_1$ = 2$$? ($$R = 1.097 	imes 10^7$ \ \mathrm{m}^{-1})$$

Accepted Answer

$$656 \ \mathrm{nm}$$

Question 4

Which of the following statements about atomic radius is correct?

Accepted Answer

Atomic radius increases down a group and decreases across a period.

Question 5

Which of the following ions is isoelectronic with $$Ar$$?

Accepted Answer

$$Cl^-$$

Question 6

Which of the following molecules is predicted to be diamagnetic?

Accepted Answer

$$N_2$$

Question 7

What is the empirical formula of a compound that contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$$C_2H_4O$$

Question 8

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Question 9

Which of the following elements is a transition metal?

Accepted Answer

Iron ($$Fe)$$

Question 10

What is the mass percent of oxygen in $$H_2O$$?

Accepted Answer

$$88.8\%$$

Question 11

Which of the following is the correct electron configuration for $$Mg$$?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$

Question 12

Which of the following is a polyatomic ion?

Accepted Answer

$$NO_3$$^-$$

Question 13

Which of the following metals forms only one cation?

Accepted Answer

Zinc ($$Zn^{2+})$$

Question 14

Which of the following is the correct Lewis dot structure for $$CO_2$$?

Accepted Answer

O=C=O with each O having 4 lone electrons

Question 15

Which of the following statements about noble gases is correct?

Accepted Answer

Noble gases have completely filled valence shells.

Question 16

Which of the following best describes the phase of matter in which atoms are most closely packed?

Accepted Answer

Solid

Question 17

Which of the following is a correct statement about the periodic trends in metallic character?

Accepted Answer

Metallic character increases down a group and decreases across a period.

Question 18

Which of the following is the correct formula for calculating the energy of a photon?

Accepted Answer

$$E = h 
u$$

Question 19

Which of the following is a correct statement about paramagnetism?

Accepted Answer

Paramagnetic substances have one or more unpaired electrons.

Question 20

A sample contains $$0.50$$ moles of $$NaCl. $$How many formula units are present in the sample? ($$N_A = 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$3.01 	imes 10$$^{23}$$

General Chemistry Study Guide: Quantum Mechanics, Periodic Properties, and Compounds

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