Question 1

Which of the following electron configurations represents the ground state of chromium (Cr)?

Accepted Answer

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

Question 2

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

Accepted Answer

$$Cl^-$$

Question 3

Which of the following orbital diagrams (from the second image) violates Hund's rule?

Accepted Answer

Diagram (b)

Question 4

Arrange the following atoms in order of increasing atomic radius: Na, Al, P, Cl, Mg.

Accepted Answer

Cl \u003c P \u003c Al \u003c Mg \u003c Na

Question 5

Which element has the following successive ionization energies (in kJ/mol): $$1086$$, $$2353$$, $$4621$$, $$6223$$, $$37831$$?

Accepted Answer

Magnesium (Mg)

Question 6

Which of the following electron configurations corresponds to an excited state?

Accepted Answer

$$1s^22s^22$p^63s^13$p^1$$

Question 7

Which of the following pairs of elements would have the most similar chemical properties?

Accepted Answer

Na and K

Question 8

Which of the following species are isoelectronic with each other?

Accepted Answer

$$Cl^-$$ and $$Ar$$

Question 9

Which element would you expect to have the greatest (most negative) electron affinity?

Accepted Answer

Cl

Question 10

Which of the following equations represents the third ionization energy of titanium?

Accepted Answer

$$Ti^{2+} (g$$) \rightarrow $$Ti^{3+} (g) + e$$^-$$

Question 11

Which of the following atoms has the largest atomic radius?

Accepted Answer

Na

Question 12

Which of the following ions has the electron configuration $$[Ar]3d$$^{10}$$?

Accepted Answer

$$Zn^{2+}$$

Question 13

Which of the following elements has the highest first ionization energy?

Accepted Answer

Ne

Question 14

Which of the following processes is represented by the equation: $$O^{2-} (g$$) \rightarrow $$O^{3-} (g) + e$$^-$$?

Accepted Answer

The electron affinity of $$O^{2-}$$

Question 15

Which of the following elements has a condensed ground-state electron configuration of $$[Ar]4s^23$d^{10}$?

Accepted Answer

Zn

Question 16

Which of the following best explains why the $$4s$$ orbital fills before the $$3d$$ orbital?

Accepted Answer

The $$4s$$ orbital is lower in energy than the $$3d$$ orbital.

Question 17

Which of the following elements would have the most negative electron affinity?

Accepted Answer

F

Question 18

Which of the following ions plays an important role in biochemical processes and has the ground-state electron configuration $$[Ar]3d^6$?

Accepted Answer

$$Fe^{2+}$$

Question 19

Which of the following atoms experiences the greatest effective nuclear charge on its valence electrons?

Accepted Answer

S

Question 20

Which of the following best describes the electron configuration of a $$M^{3+}$$ ion derived from a first-row transition metal with five electrons in the $$3d$$ subshell?

Accepted Answer

The element is manganese (Mn).

Electron Configurations and Periodic Trends – Guided Study Notes

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