Question

The 'spin only' magnetic moment value of $MO_4^{2-}$ is ____ $\text{BM}$. (Where $M$ is a metal having least metallic radii among $\text{Sc, Ti, V, Cr, Mn, Zn}$). $[ \text{Given atomic number: Sc = 21, Ti = 22, V = 23, Cr = 24, Mn = 25, Zn = 30} ]$

Answer 1

Among the given elements, Cr has the least metallic radii. The CrO$_4^{2-}$ ion has Cr$^{6+}$, which has a $d^0$ configuration (diamagnetic).
The spin-only magnetic moment:
$\mu = \sqrt{n(n+2)} \, \text{BM},$
where $n = 0$.
Final Answer:
$0 \, \text{BM}.$

Answer 2

Among the given elements, Cr has the least metallic radii. The CrO$_4^{2-}$ ion has Cr$^{6+}$, which has a $d^0$ configuration (diamagnetic).
The spin-only magnetic moment:
$\mu = \sqrt{n(n+2)} \, \text{BM},$
where $n = 0$.
Final Answer:
$0 \, \text{BM}.$