Question 1

Which of the following elements would you expect to have chemical properties most similar to sulfur (S)?

Accepted Answer

Selenium (Se)

Question 2

What is the electron configuration for a neutral germanium (Ge) atom in its ground state?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^6$$ $$4s^2$$ $$3d^{10}$$ $$4p^2$$

Question 3

Which of the following statements about atomic radius is correct?

Accepted Answer

Atomic radius decreases from left to right across a period.

Question 4

Which element has the highest first ionization energy among the following: Na, K, Rb, Cs?

Accepted Answer

Na

Question 5

What is the correct electron configuration for the Ti$$^{2+}$$ ion?

Accepted Answer

$$[Ar] 3d^2$

Question 6

Which of the following pairs are isoelectronic?

Accepted Answer

Na$$^+$$ and Mg$$^{2+}$$

Question 7

Which of the following ions has the largest ionic radius?

Accepted Answer

F$$^-$$

Question 8

Which of the following elements has an anomalous electron configuration due to increased stability of a half-filled or fully-filled d subshell?

Accepted Answer

Chromium (Cr)

Question 9

According to Hund's Rule, which electron arrangement is most stable for a set of degenerate orbitals?

Accepted Answer

Electrons fill each orbital singly with parallel spins before pairing.

Question 10

Which of the following best describes the Pauli Exclusion Principle?

Accepted Answer

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

Question 11

Which of the following elements has the highest effective nuclear charge ($$Z_{eff}) $$for its valence electrons?

Accepted Answer

Fluorine (F)

Question 12

Which of the following ions is isoelectronic with Argon (Ar)?

Accepted Answer

Cl$$^-$$

Question 13

Which of the following elements has the lowest atomic radius?

Accepted Answer

Neon (Ne)

Question 14

Which of the following statements about ionization energy is correct?

Accepted Answer

Ionization energy increases across a period from left to right.

Question 15

Which of the following electron configurations represents a transition metal ion after losing electrons?

Accepted Answer

$$[Ar] 3d^6$

Question 16

Which of the following elements has the greatest electron affinity?

Accepted Answer

Chlorine (Cl)

Question 17

Which of the following ions has the smallest ionic radius?

Accepted Answer

Al$$^{3+}$$

Question 18

Which of the following electron configurations is correct for the Cu atom?

Accepted Answer

$$[Ar] 4s^1$ 3d$$^{10}$$

Question 19

Which of the following best describes the Aufbau Principle?

Accepted Answer

Electrons fill orbitals of lowest energy first.

Electron Configuration and Periodic Properties: Study Notes

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