Question

Which of the following transition metal ions will have definite value of magnetic moment?

• A. $S{c}^{3+}$
• B. $T{i}^{3+}$
• C. $C{u}^{+}$
• D. $Z{n}^{2+}$

Answer 1

Answer: (B)

Value of magnetic moment depends upon number of unpaired electrons.
All given metal ions (except $T{i}^{3+}\left(3d^1\right)$ ) have either fully filled d-subshell $\left(Z{n}^{2+},C{u}^{+}\right)$or empty d-subshell $\left(S{c}^{3+}\right)$.
As such only $T{i}^{3+}$ has a net value of magnetic moment.
Magnetic moment of $T{i}^{3+}=\sqrt{n(n+2)}BM$
$=\sqrt{1(1+2)}BM$
$=\sqrt{3}BM$
$=1.73BM$.