Question

Review the electron configurations of the elements in period 4, moving from potassium (K) to krypton (Kr). Select all the elements in period 4 that have electron configurations different from what the rules predict they should have.

Answer 1

Answer:

Chromium (Cr) and Copper (Cu)

Explanation:

Answer 2

Chromium (Cr) and Copper (Cu) have electron configurations different from what the rules predict in period 4.

What is an electron configuration?

Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.

The order of filling of electrons occupying the 3d subshell gets concerned in chromium and copper and because of distress in 3d subshell, these elements possess exceptional configuration.

Hence, Chromium (Cr) and Copper (Cu) have electron configurations different from what the rules predict in period 4.

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