Question 1

Which quantum number determines the energy level (shell) of an electron in an atom?

Accepted Answer

Principal Quantum Number ($$n)$$

Question 2

Which of the following elements is most likely to be diamagnetic?

Accepted Answer

Neon ($$Z=10)$$

Question 3

Given the Rydberg equation $$E_n = -2.18 	imes 10$$^{-18}$$ \left( \frac{1}{n^2$} ight) J$$, what is the energy of an electron in the $$n=3$$ level of a hydrogen atom?

Accepted Answer

$$-2.42 	imes 10$$^{-20}$$ J

Question 4

Which of the following sets of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

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

Question 5

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

Accepted Answer

Fluorine ($$F)$$

Question 6

Which statement best explains why atomic radius decreases across a period from left to right?

Accepted Answer

Nuclear charge increases, pulling electrons closer.

Question 7

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?

Accepted Answer

$$CH_2O$$

Question 8

Which of the following molecules is predicted to be linear based on its Lewis structure?

Accepted Answer

$$CO_2$$

Question 9

Which of the following ions is a polyatomic ion?

Accepted Answer

$$NO_3$$^-$$

Question 10

Which of the following metals forms only one type of cation?

Accepted Answer

Sodium

Question 11

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

Accepted Answer

Ionic bonds involve transfer of electrons; covalent bonds involve sharing of electrons.

Question 12

Which of the following is a transition element?

Accepted Answer

Iron

Question 13

Which of the following is a noble gas?

Accepted Answer

Argon

Question 14

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

Accepted Answer

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

Question 15

Which of the following is the correct formula for magnesium nitrate?

Accepted Answer

$$Mg(NO_3$)_2$$

Question 16

Which of the following statements about effective nuclear charge ($$Z_{eff}) is $$correct?

Accepted Answer

$$Z_{eff}$$ increases across a period.

Question 17

A sample contains 0.50 moles of $$NaCl. $$How many formula units are present? (Avogadro's number $$= 6.022 	imes 10$$^{23}$$)

Accepted Answer

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

Question 18

Which of the following best describes a node in an atomic orbital?

Accepted Answer

A region where the probability of finding an electron is zero.

Question 19

Which of the following is an example of a hydrate?

Accepted Answer

$$CuSO_4$$ \cdot 5H_2O$$

Question 20

Which of the following is an organic compound?

Accepted Answer

$$CH_4$$

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

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