Question 1

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

$$l ($$Angular Momentum Quantum Number)

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

Which of the following electron configurations represents a transition metal ion with a $$2+$$ charge, given that electrons are removed from the highest $$n-$$value orbitals first?

Accepted Answer

$$[Ar] 4s^0$ 3d^3$

Question 4

Which element has the highest first ionization energy among the following: Na, Mg, Al, Si?

Accepted Answer

Si

Question 5

What is the electron configuration for the fluoride ion ($$F^-$$)?

Accepted Answer

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

Question 6

Which of the following statements about atomic radius is correct?

Accepted Answer

Atomic radius decreases across a period from left to right.

Question 7

Which of the following ions is paramagnetic?

Accepted Answer

$$Fe^{3+}$$

Question 8

Which orbital is filled first in the electron configuration of potassium ($$K$$)?

Accepted Answer

$$4s$$

Question 9

What is the effective nuclear charge ($$Z_{eff}) $$experienced by a valence electron in a multielectron atom?

Accepted Answer

$$Z_{eff} = Z - S$$

Question 10

Which of the following elements is most metallic?

Accepted Answer

Sodium

Question 11

Which of the following is the correct order of sublevel energies in a multielectron atom?

Accepted Answer

$$E(s) \u003c E(p) \u003c E(d) \u003c E(f)$$

Question 12

Which of the following elements has the most negative (most exothermic) electron affinity?

Accepted Answer

Chlorine

Question 13

Which of the following ions is largest in size?

Accepted Answer

$$F^-$$

Question 14

Which principle states that electrons fill orbitals of lowest energy first?

Accepted Answer

Aufbau Principle

Question 15

Which of the following electron configurations is correct for $$Cr ($$chromium), based on experimental evidence?

Accepted Answer

$$[Ar] 4s^1$ 3d^5$

Question 16

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

Accepted Answer

$$m_l ($$Magnetic Quantum Number)

Question 17

Which of the following is true about the electron configuration of transition metal cations?

Accepted Answer

Electrons are removed from the highest $$n-$$value orbitals first.

Question 18

Which of the following elements has a half-filled $$p$$ sublevel in its ground state electron configuration?

Accepted Answer

Nitrogen

Question 19

Which of the following best explains why atomic radii of transition metals are roughly the same size across the $$d$$ block?

Accepted Answer

The number of electrons in the outermost principal energy level is nearly constant.

Question 20

Which rule states that when filling orbitals of the same energy, one electron is placed in each orbital before pairing?

Accepted Answer

Hund's Rule

Chapter 9: Periodic Properties of the Elements – Quantum Mechanical Foundations and Electron Configurations

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