Which one will have the highest 2nd ionisation energy?
A. 1s2 2s2 2p6 3s1
B. 1s2 2s2 2p4
C. 1s2 2s2 2p6
D. 1s2 2s2 2p6 3s2
Answer:A
Which one will have the highest 2nd ionisation energy?
A. 1s2 2s2 2p6 3s1 B. 1s2 2s2 2p4 C. 1s2 2s2 2p6 D. 1s2 2s2 2p6 3s2