• # question_answer Number of unpaired electrons in the ground state of beryllium atom is A)                 2              B)                 1 C)                 0              D)                 All the above

$B{{e}_{4}}=1{{s}^{2}},\,2{{s}^{2}}$=  (Ground state)                 Number of unpaired electrons in the ground state of Beryllium atom is zero.