Which of the following graph is correct representation between atomic number ( $Z$ ) and magnetic mo

Question

Which of the following graph is correct representation between atomic number ( $Z$ ) and magnetic moment of $d$-block elements? [Outer electronic configuration : $(n-1) d^x n s^{1 	ext { or } 2}$ ]

Professor PC Thomas Classes · Answer

(d) Magnetic moment $=\sqrt{n(n+2)}$ BM 
N : Number of unpaired $e^{-}$ 
As atomic number increases in $d$-block element number of unpaired $e^{-}$first increases upto middle then decreases.