Question

Magnetic moment of $C{r}^{+2}(Z=24),M{n}^{+2}$ (Z=25) and $F{e}^{2+}(Z=26)$ are $x,y,z$ They are in order :

• A. $x<y<z$
• B. $x>y>z$
• C. $z<x=y$
• D. $x=z<y$

Answer 1

The correct option is D $x=z<y$

${}_{24}C{r}^{2+}\left[Ar\right]3d^4$ so n=4 ;
${}_{25}M{n}^{2+}\left[Ar\right]$$3d^5$ so n =5 ;
${}_{26}F{e}^{2+}\left[Ar\right]3d^6$ so n =4
n= Number of unpaired electron(s).
So the correct order of magnetic moment is =$x=z<y$