For d block elements the first ionization potential is of the order

Options

A. `Zn gt Fe gt Cu gt Cr`
B. `Sc = Ti lt V= Cr`
C. `Zn gt Cu gt lt Ni lt Co`
D. `V gt Cr gt Mn gt Fe`

Answer

A

Explanation

The ionisation energies increases with increase in atomic number. However, the trend is irregular among some d - block elements. On the basis of electronic configuration, the
Zn : ` 1 s ^ 2 2 s^ 2 p ^ 6 d ^ ( 10 ) 4 s ^ 2 `
` Fe : 1 s ^ 2 2 s ^ 2 p ^ 6 3 s ^ 2 p ^ 6 d ^ 6 4s ^ 2 `
Cu : ` 1 s ^ 2 2 s ^ 2 p ^ 6 d ^ ( 10 ) 4 s ^ 1 `
Cr : ` 1 s ^ 2 2 s ^ 2 p ^ 6 3 s ^ 2 p ^ 6 d ^ 5 4 s ^ 1 `
` IE _ 1 ` follows the order: ` Zn gt Fe gt Cu gt Cr `