Phosphorus has five valence electrons and hydrogen has one valence electron. what would be the lewis dot (electron dot) structure for the covalent compound phosphorus trihydride?

PH3 looks just like ammonia NH3 with a lone pair and 3 hydrogens in a pyramidal formation. 

In PH3 the P has 3 bond pairs and 1 lone pair, (4 total pairs). The shape is called trigonal pyramidal (approximately tetrahedral minus one atom).

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