Question 1

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number $$\ell$$

Question 2

According to the Pauli exclusion principle, which of the following is true for electrons in the same orbital?

Accepted Answer

They must have opposite spins ($$m_s = +1/2$$ and $$m_s = -1/2)$$

Question 3

Which electron configuration represents the ground state of oxygen?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 4

Which of the following best explains why the $$3p$$ sublevel is higher in energy than the $$3s$$ sublevel in multi-electron atoms?

Accepted Answer

Electron-electron repulsion and shielding effects

Question 5

Which of the following ions has the largest ionic radius?

Accepted Answer

$$\mathrm{Cl^-}$$

Question 6

What is the electron configuration for $$\mathrm{Fe$$^{2+}$$}$$?

Accepted Answer

$$[\mathrm{Ar}]\ 3d^6$

Question 7

Which element has the highest first ionization energy?

Accepted Answer

Neon ($$\mathrm{Ne})$$

Question 8

Which of the following statements about atomic radius is correct?

Accepted Answer

Atomic radius decreases from left to right across a period

Question 9

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

Accepted Answer

Nitrogen ($$\mathrm{N})$$

Question 10

What is the effective nuclear charge ($$Z_{\mathrm{eff}}) $$experienced by a valence electron in a main group atom as you move from left to right across a period?

Accepted Answer

$$Z_{\mathrm{eff}}$$ increases

Question 11

Which of the following electron configurations represents a transition metal in its ground state?

Accepted Answer

$$[\mathrm{Ar}]\ 4s^2$\ 3d^6$

Question 12

Which of the following is the correct order of sublevel energies in a multi-electron atom?

Accepted Answer

$$3s \u003c 3p \u003c 3d \u003c 4s$$

Question 13

Which of the following elements has the greatest metallic character?

Accepted Answer

Cesium ($$\mathrm{Cs})$$

Question 14

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

Accepted Answer

$$[\mathrm{Ar}]\ 3d$$^{10}$$

Question 15

Which of the following best describes the trend in electron affinity across a period?

Accepted Answer

Electron affinity becomes more negative from left to right

Question 16

Which quantum numbers are needed to uniquely identify an electron in an atom?

Accepted Answer

$$n,\ \ell,\ m_\ell,\ m_s$$

Question 17

Which of the following elements has the smallest atomic radius?

Accepted Answer

Fluorine ($$\mathrm{F})$$

Question 18

When forming a cation from a transition metal, which electrons are removed first?

Accepted Answer

Electrons from the highest principal quantum number $$n ($$usually $$s$$ orbital)

Question 19

Which of the following is a correct statement about penetration and shielding?

Accepted Answer

Electrons in orbitals with greater penetration experience less shielding and higher $$Z_{\mathrm{eff}}$$

Question 20

Which of the following elements is most likely to form a diamagnetic ion?

Accepted Answer

Zinc ($$\mathrm{Zn$$^{2+}$$})$$

Periodic Properties of the Elements (Chapter 9): Quantum Numbers, Energy Levels, and Electron Configurations

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