Q17 / 170 · Manipal (MET) 2019 · Chemistry

Which of the following has highest second ionisation energy

Correct answer
A
Chromium
B
Calcium
C
Iron
D
Cobalt

Solution

The electronic configuration of ${ }_{24} C_r$ is $[\mathrm{Ar}]_{18} 3 d_1^5 4 s^1$. Chromium after loss of one electron gain stable configuration due to presence of half filled d-orbitals, therefore its second ionisation enthalphy is highest.

Hence, the correct answer is option: 'A'.

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