Multiple choice

From the ground state of electronic configuration of various electrons, which will have the highest second ionisation energy?

  1. 1s2, 2s2, 2p6, 3s2

  2. 1s2, 2s2, 2p6, 3s1

  3. 1s2, 2s2, 2p6

  4. 1s2, 2s2, 2p5

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The removal of second electron will be from completely filled p-orbital, so it will need the highest energy.