Question 1

Which of the following is the correct condensed electron configuration for Ag$$^+ (Z = 47$$)?

Accepted Answer

$$[Kr]\ 5s^1$\ 4d$$^{10}$$

Question 2

For which of the following elements does the electron configuration violate the expected Aufbau principle due to increased stability of a half-filled or fully-filled d subshell?

Accepted Answer

Chromium (Cr)

Question 3

What is the condensed electron configuration for Ru (Ruthenium, Z = 44)?

Accepted Answer

$$[Kr]\ 5s^1$\ 4d^7$

Question 4

Given the electron configuration $$[Kr]\ 5s^0$\ 4d$$^{10}$$, which ion does this configuration represent?

Accepted Answer

Ag$$^+$$

Question 5

Which of the following best explains why Cr (Z = 24) has the electron configuration $$[Ar]\ 4s^1$\ 3d^5$ instead of $$[Ar]\ $$4s^2$$\ $$3d^4$$?

Accepted Answer

A half-filled d subshell ($$3d^5) is $$more stable due to exchange energy.

Question 6

Which element in Period 5 has an electron configuration exception similar to that of Chromium in Period 4?

Accepted Answer

Molybdenum (Mo)

Question 7

What is the condensed electron configuration for Au (Gold, Z = 79)?

Accepted Answer

$$[Xe]\ 6s^1$\ 4f$$^{14}$$\ 5d$$^{10}$$

Question 8

Which of the following ions has the electron configuration $$[Kr]\ 4d^8$?

Accepted Answer

Ru$$^{2+}$$

Question 9

Why do transition metals often form ions with the loss of s electrons before d electrons?

Accepted Answer

The s electrons are higher in energy after d orbitals are filled.

Question 10

Which of the following is the correct condensed electron configuration for Nb (Niobium, Z = 41)?

Accepted Answer

$$[Kr]\ 5s^1$\ 4d^4$

Question 11

A sample contains ions with the electron configuration $$[Kr]\ 4d^8$. Which element and charge does this correspond to?

Accepted Answer

Ruthenium (Ru$$^{2+})$$

Question 12

Which of the following best describes the electron configuration of transition metal ions?

Accepted Answer

Electrons are removed from the s subshell before the d subshell.

Question 13

Which of the following elements has a condensed electron configuration of $$[Ar]\ 4s^1$\ 3d^5$?

Accepted Answer

Chromium (Cr)

Question 14

What is the condensed electron configuration for Cu (Copper, Z = 29)?

Accepted Answer

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

Question 15

Which of the following is a reason for the electron configuration exception in Ru (Ruthenium)?

Accepted Answer

Stability due to a half-filled s orbital and a nearly filled d orbital.

Question 16

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

Accepted Answer

Cu$$^+$$

Question 17

Which element has the electron configuration $$[Xe]\ 6s^1$\ 4f$$^{14}$$\ 5d$$^{10}$$?

Accepted Answer

Gold (Au)

Question 18

Which of the following is the correct condensed electron configuration for Ag (Silver, Z = 47)?

Accepted Answer

$$[Kr]\ 5s^1$\ 4d$$^{10}$$

Question 19

Which of the following best describes the electron configuration of Nb (Niobium, Z = 41)?

Accepted Answer

$$[Kr]\ 5s^1$\ 4d^4$

Electron Configurations of Transition Metals & Exceptions

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