Answer is : (3)
Enthalpy of atomisation
Sc – 326 kJ mol–1
Ti – 473 kJ mol–1
Mn – 281 kJ mol–1
Co – 425 kJ mol–1
Ti has highest heat of atomisation
\(\text{Ti}^{2+} \Rightarrow 3 \text{d}^2\)
\(\mu _\text{spin only} = \sqrt{n(n+2)} \text{BM}\)
n = number of unpaired electrons
= 2
\(\mu = \sqrt{2(2+2)}\)
\(= \sqrt{8}\ \text{BM}\)
= 2.82 BM
\(\approx 3\ \text{BM}\)
