Highest ionisation potential in a period is shown by

Highest ionisation potential in a period shown by

Generally the ionisation potential in a period increases, but there are some exceptions. The one which is not an exception is

The element with the highest ionization potential in the periodic table is:

The familyof elements having highest ionisation enthalpy in the periodic table is

Which element of the following has the highest ionisation potential? Na, Cl, Si and Ar.