The first ionisation energies of the elements of the first transition series `(TitoCu)`

Options

A. increases as the atomic number increases
B. decreases as the atomic number invreases
C. do not show any change as the addition of electrons takes place in the inner (n- 1) d orbitals
D. increases from Ti to Mn and then decreases from Mn to Cu.

Answer

A

Explanation

First ionisation energy of the elements of first transition series `(Ti to Cu)` increases as the atomic number increases due to increases of nuclear charge. The increase however is not regular.