Question

How can I draw the Lewis structure for PH3?

Answer 1

Phosphosus has an electron configuration of `[Ne] 2s^2 2p^3`.
Therefore, it has a dot digram in the red of two electrons on top and one electron on each side. Providing for three open bonding sites.

Hydrogen has an electron configuration of `1s^1`. Therefore, it has only one electron on top. Each of the three hydrogens will fill one of the empty spaces of the phosphorus atom in a covalent bond. This will provide eight electrons for phosphorus, to complete the rule of octet.

Each hydrogen now has two electrons to complete the rule of duet.

I hope this was helpful.
SMARTERTEACHER