Question 1

Which quantum number is responsible for distinguishing the two possible spin states of an electron?

Accepted Answer

Spin quantum number, $$m_s$$

Question 2

According to the Pauli Exclusion Principle, what is the maximum number of electrons that can occupy a single orbital?

Accepted Answer

Two

Question 3

How many electrons can be accommodated in the $$n=3$$ shell?

Accepted Answer

18

Question 4

Which rule states that electrons fill degenerate orbitals singly and with parallel spins before pairing up?

Accepted Answer

Hund's Rule

Question 5

For a multi-electron atom, which subshell is lower in energy: $$3d or$$ $$4s$$?

Accepted Answer

$$4s$$

Question 6

What is the electron configuration for a neutral sodium atom ($$Na$$)?

Accepted Answer

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

Question 7

Which elements are filling the $$5f$$ subshell?

Accepted Answer

Actinides

Question 8

How many unpaired electrons are found in the ground state electron configuration of selenium ($$Se$$)?

Accepted Answer

2

Question 9

When forming a $$Fe^{2+}$$ ion from a neutral iron atom, which electrons are removed first?

Accepted Answer

The $$4s$$ electrons

Question 10

Which of the following ions is paramagnetic?

Accepted Answer

$$Fe^{3+}$$

Question 11

What is the maximum number of electrons that can be accommodated in the $$n=4$$ shell?

Accepted Answer

32

Question 12

Which quantum number describes the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number, $$m_l$$

Question 13

Which of the following electron configurations represents an atom with all paired electrons?

Accepted Answer

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

Question 14

Which of the following elements has a ground-state valence shell configuration of $$ns^2$$ $$np^2$$?

Accepted Answer

Si

Question 15

Why do some transition metals have irregular electron configurations, such as $$Cr$$ and $$Cu$$?

Accepted Answer

Due to the special stability of a completely filled or half-filled subshell

Question 16

Which of the following best describes a diamagnetic atom?

Accepted Answer

An atom with all electrons paired that is not attracted to a magnetic field

Question 17

What is the correct order of filling for the following orbitals: $$4s$$, $$3d$$, $$4p$$?

Accepted Answer

$$4s \rightarrow 3d \rightarrow 4p$$

Question 18

Which equation gives the maximum number of electrons that can be accommodated in a shell with principal quantum number $$n$$?

Accepted Answer

$$2n^2$$

Question 19

For a hydrogen atom, the energy of an electron depends only on which quantum number?

Accepted Answer

Principal quantum number, $$n$$

Question 20

Which of the following is the correct electron configuration for $$Fe^{3+}$$?

Accepted Answer

$$[Ar] 3d^5$

Quantum Numbers, Electron Configurations, and Magnetism in Atoms

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