• # question_answer 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

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