Question

Which of the following elements is a metalloid?

• A. Lithium
• B. Beryllium
• C. Boron
• D. Carbon

Answer 1

Answer: (C)

Explanation:

• The electronic configuration of boron is $1s^{2}2s^{2}2s^1$.
• It can either donate or accept electrons to get the stable configuration.
• Boron can act as both metal and non metal.
• Hence, it is a metalloid.

Hence, option (D) is correct.