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Troyanec [42]
3 years ago
8

Choose the ground state electron configuration for Cr3+.

Chemistry
1 answer:
alukav5142 [94]3 years ago
5 0

Answer:

b) [Ar]4s²3d1¹

Explanation:

Chromium, Cr, is the atom with atomic number 24 (That is, 24 protons).

A Cr³⁺ contains 3 electrons less than number of protons. That is 21electrons.

The Argon, Ar, contains 18 electrons. That means the electronic configuration of Cr³⁺ contains 3 electrons more than Ar.

Following the Hund's rule, these three electrons will occupy the 4S orbital (2 electrons) and the 2d orbital (1 electron).  

Thus, right solution is:

<h3>b) [Ar]4s²3d1¹</h3>

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