Question

In the ground state of cobalt atom (Z = 27) there are ....... unpaired electrons and thus the atom is.......

• A. 2, diamagnetic
• B. 2, paramagnetic
• C. 3, diamagnetic
• D. 3, paramagnetic

Answer 1

Answer: (D)

3, paramagnetic

Answer 2

$Co - \lbrack Ar\rbrack 3d^{7}4s^{2}$, it has 3 unpaired $e^{-}$so it is a paramagnetic.