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Solution: a. How many electrons does a Co atom have in its 3d subshell?b. How many of those electrons are unpaired? 

Problem

a. How many electrons does a Co atom have in its 3d subshell?

b. How many of those electrons are unpaired? 

Solution

We are being asked how many electrons are present in the 3d subshell of Co atom and how many of those electrons are unpaired. Let’s first write the electron configuration of Co atom.

Neutral element:       Atomic number = # protons = # of electrons

Cobalt (Co):

Atomic number = 27
# of electrons = 27 e- 

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