Question

In which of the following elements does the distinguishing electron occupy a d subshell?

a. Cr

b. O

c. Kr

d. Sr

Answer 1

Chromium (Cr) is the element in which the distinguishing electron occupies a d subshell.

Step-by-step explanation:

The element in which the distinguishing electron occupies a d subshell is a. Cr (Chromium).

The electron configuration of Chromium is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵. The d subshell is occupied by 5 electrons in this case.

Answer 2

A. Chromium.

Step-by-step explanation:

a. Cr (Chromium): [Ar] 4s1 3d5

The distinguishing electron in Cr occupies the 3d subshell.

b. O (Oxygen): [He] 2s2 2p4

The distinguishing electron in O occupies the 2p subshell.

c. Kr (Krypton): [Ar] 4s2 3d10 4p6

The distinguishing electron in Kr occupies the 4p subshell.

d. Sr (Strontium): [Kr] 5s2

The distinguishing electron in Sr occupies the 5s subshell.

Therefore, the element in which the distinguishing electron occupies a d subshell is chromium.