Question 1

Which set 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 2

How many electrons can occupy all of the orbitals in the $$n = 3$$ shell of an atom?

Accepted Answer

$$18$$

Question 3

Which of the following ions is isoelectronic with argon ($$\mathrm{Ar}$$)?

Accepted Answer

$$\mathrm{K}^+$$

Question 4

What is the electron configuration for the $$\mathrm{Fe}^{3+}$$ ion?

Accepted Answer

$$1s^22s^22$p^63s^23$p^63d^5$

Question 5

Which of the following statements about the Pauli exclusion principle is CORRECT?

Accepted Answer

No two electrons in the same atom can have the same set of all four quantum numbers.

Question 6

Which element has the ground state electron configuration $$1s^22s^22$p^63s^23$p^1$$?

Accepted Answer

Aluminum ($$\mathrm{Al})$$

Question 7

How many orbitals are in the $$4d$$ subshell?

Accepted Answer

$$5$$

Question 8

Which of the following ions has a pseudo-noble gas configuration?

Accepted Answer

$$\mathrm{Sn}^{4+}$$

Question 9

A neutral atom has the electron configuration $$1s^22s^22$p^63s^23$p^64s^1$. What is the identity of this atom?

Accepted Answer

Potassium ($$\mathrm{K})$$

Question 10

Which of the following best describes a paramagnetic substance?

Accepted Answer

A substance with one or more unpaired electrons that is weakly attracted to a magnetic field.

Question 11

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 12

How many possible values of $$m_l$$ are there for a $$d$$ orbital?

Accepted Answer

$$5$$

Question 13

Which of the following ions is isoelectronic with neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{O}^{2-}$$

Question 14

What is the maximum number of electrons that can occupy the $$n = 4$$ shell?

Accepted Answer

$$32$$

Question 15

Which of the following electron configurations represents an excited state of a carbon atom?

Accepted Answer

$$1s^22s^22$p^13s^1$

Question 16

Which of the following best explains why noble gases do not tend to form ions?

Accepted Answer

They already possess a full outer shell of electrons, making them electronically stable.

Question 17

Which of the following is the correct order of filling for the subshells according to the Aufbau principle?

Accepted Answer

$$1s,\ 2s,\ 2p,\ 3s,\ 3p,\ 4s,\ 3d,\ 4p$$

Question 18

A sample of magnesium metal is placed in a flame and emits light. Which process best explains the emission of light?

Accepted Answer

Electrons absorb energy and move to higher energy levels, then emit photons as they return to lower energy levels.

Question 19

Which of the following ions has the same electron configuration as krypton ($$\mathrm{Kr}$$)?

Accepted Answer

$$\mathrm{Rb}^+$$

Question 20

Which quantum number(s) must be different for two electrons in the same orbital?

Accepted Answer

Spin quantum number ($$m_s)$$

Quantum Numbers, Atomic Orbitals, and Electron Configurations

스터디 가이드 - 연습 문제