From the ground state electronic configuration of the elements given below

CHEMISTRY · Single correct · A Level · Chemistry · Periodicity and periodic trends · Periodicity and periodic trends

Problem

From the ground state electronic configuration of the elements given below, pick up the one with highest value of second ionization energy : (1)

1s^2 2s^2 2p^6 3s^2

(2)

1s^2 2s^2 2p^6 3s^1

(3)

1s^2 2s^2 2p^6

(4)

1s^2 2s^2 2p^5