Question

Which one will have the highest 2nd ionisation energy?

a. 1s²2s²2p⁶3s¹
b.1s²2s²2p⁴
c.1s²2s²2p⁶
d.1s²2s²2p⁶3s²

Please answer along with explanation​

Answer 1

so correct option is option a

Explanation:

The element with electronic configuration 1s

2

2s

2

2p

6

3s

1

will have highest second ionization enthalpy. 1s

2

2s

2

2p

6

3s

1

loses one electron to form 1s

2

2s

2

2p

6

. It is stable electronic configuration of noble gas Ne. Removal of second electron will require large amount of energy as it will break stable noble gas electronic configuration