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  4. How many unpaired electrons are present in cobalt [Co] metal?

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Q. How many unpaired electrons are present in cobalt $ [Co] $ metal?

Rajasthan PMTRajasthan PMT 2002The d-and f-Block Elements

Solution:

Co (atomic number $=27$)
$=1^{2}, 2 s^{2} \,2 p^{6}, 3 s^{2}\, 3 p^{6} \,3 d^{7}, 4 s^{2}$
Thus, number of unpaired electrons $=3$