Question

The electron affinity of Be is almost similar to that of -

• A. Li
• B. B
• C. Na
• D. Ne

Answer 1

The correct option is D

Ne

First, Lets look at the electronic configurations of elements in question.

Be → 1s²2s²

Li → 1s²2s¹

B → 1s²2s²2p¹

Na → 1s²2s²2p⁶3s¹

Ne → 1s²2s²2p⁶

We can see that,

Both Be → 1s²2s² and Ne → 1s²2s²2p⁶ have fully filled orbital configuration. So it will be very hard to add an electron to these configurations.

Therefore, EA of Be will be almost similar to Ne.