Which of the following elements has the highest metallic character?
Element $-$ $IP$ (Ionization Potential)

If the successive ionisation energies of an element $A$ are $165$,$190$,$550$ and $595 \ kcal$,respectively,then the ground state electronic configuration of element $A$ is

Highest energy will be absorbed to eject out the electron in the configuration:

The correct order of $C$, $N$, $O$ and $F$ in terms of second ionisation potential is

What is the significance of the terms 'isolated gaseous atom' and 'ground state' while defining the ionization enthalpy and electron gain enthalpy?

Identify the element having the highest ionization enthalpy.