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How can I draw the Lewis structure for PH3?
Phosphosus has an 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 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