Question

What is the valence electron of manganese?​

Answer 1

Answer: [Ar] 3d5 4s2

Step-by-step explanation:

Manganese is a transition metal, meaning that it can have more than one valence state. Its electron configuration is [Ar] 3d5 4s2. The two electrons in the 4s orbital are obvious valence electrons, so a valence state of 2+ is possible.

Answer 2

25th electron

Step-by-step explanation:

the last electron is the valence electron. Assuming it has equal numbers of protons and electrons, then the 25th electron is the valence.