Question 1

Which quantum number determines the overall size and energy of an atomic orbital?

Accepted Answer

The principal quantum number $$n$$

Question 2

What is the maximum number of electrons that can occupy a single $$p$$ subshell?

Accepted Answer

$$6$$

Question 3

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 4

Which orbital is depicted by a shape with eight lobes oriented along the axes, as seen in the first image?

Accepted Answer

$$f$$ orbital

Question 5

According to the Pauli Exclusion Principle, which statement is correct?

Accepted Answer

Two electrons in the same orbital must have opposite spins.

Question 6

Which of the following electron configurations is the correct ground state for chromium ($$Cr$$)?

Accepted Answer

$$1s^22s^22$p^63s^23$p^64s^13$d^5$$

Question 7

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

Accepted Answer

Magnetic quantum number $$m_l$$

Question 8

What is the total number of orbitals in the $$n=3$$ shell?

Accepted Answer

$$9$$

Question 9

Which orbital has the greatest penetration (ability to get close to the nucleus) in a multi-electron atom?

Accepted Answer

$$4s$$

Question 10

Which rule explains why nitrogen’s ground state electron configuration has three unpaired electrons in the $$2p$$ orbitals?

Accepted Answer

Hund’s Rule

Question 11

How many radial nodes are present in a $$3p$$ orbital?

Accepted Answer

$$1$$

Question 12

Which of the following best describes the difference between a classical trajectory and a quantum-mechanical probability distribution?

Accepted Answer

A classical trajectory predicts a definite path, while a quantum-mechanical probability distribution predicts the likelihood of finding a particle in a region.

Question 13

What is the maximum number of electrons that can occupy the $$n=2$$ shell?

Accepted Answer

$$8$$

Question 14

Which of the following orbitals can have $$l=2$$ and $$m_l=0$$?

Accepted Answer

$$3d_{z^2$}$$

Question 15

Which of the following statements about shielding is correct?

Accepted Answer

Shielding reduces the effective nuclear charge felt by outer electrons.

Question 16

If an electron has quantum numbers $$n=4$$, $$l=3$$, $$m_l=2$$, what type of orbital is it in?

Accepted Answer

$$4f$$

Question 17

Which of the following is a valid set of quantum numbers for an electron in a $$3d$$ orbital?

Accepted Answer

$$n=3,\ l=2,\ m_l=2,\ m_s=+\frac{1}{2}$$

Question 18

Which of the following best explains why the $$4s$$ orbital fills before the $$3d$$ orbital in the ground state electron configuration of potassium?

Accepted Answer

The $$4s$$ orbital has a lower energy than the $$3d$$ orbital due to greater penetration.

Question 19

How many possible values of $$m_l$$ are there for an $$f$$ orbital?

Accepted Answer

$$7$$

Question 20

Which of the following statements about electron spin is correct?

Accepted Answer

Electron spin quantum number $$m_s$$ can be $$+\frac{1}{2} or$$ $$-\frac{1}{2}.$$

Atomic Orbitals and Quantum Numbers: Structure, Properties, and Electron Configuration

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