b
(b) \(_{24}Cr \to 1{s^2},\,2{s^2},\,\mathop {2{p^6}}\limits_{l = 1} ,\,3{s^2},\,\mathop {3{p^6}}\limits_{l = 1} ,\mathop {\,3{d^5}}\limits_{l = 2} ,\,4{s^1}\) (We know that for \(p\) the value of \(l = 1\) and for \(d,\) \(l = 2)\) For \(l = 1\) total number of electron \(= 12\) For \(l = 2\) total number of electron \(= 5.\)