Question

Which one of the following does not achieve an octet of electrons in the central atom?

Options

• BiH₃

• PH₃

• BH₃

• AsH₃

Answer 1

BH₃ 

Explanation:

The central atom of BH₃ does not have an octet of electrons. With only 6e^- on the central metal atom, BH₃ is electron deficient.