Question

values of 1st four ionization energie (in kJ/mol) of an element are 496, 4563, 6913, 9541 respectively. The electronic configration of that element can be

Answer 1

there is a big difference between first and second IE.

This suggests that the element should be in group 1 or ns1 configuration.

The first IE of 496 suggests from the table of IE that correlates with Sodium.

Hence the electronic configuration is 1s2 2s2 2p6 3s1