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## Q. 1.1

Predicting the number of Bonds Formed by atoms in molecules

How many hydrogen atoms does phosphorus bond to in phosphine, $PH_?$?

S t r a t e g y
Identify the periodic group of phosphorus, and tell from that how many electrons (bonds) are needed to make an octet.

## Verified Solution

Phosphorus, like nitrogen, is in group 5A of the periodic table and has five valence electrons. It thus needs to share three more electrons to make an octet and therefore bonds to three hydrogen atoms, giving $PH_{3}$.