Question 4.3: Drawing an Electron-Dot Structure Draw an electron-dot struc......

General Chemistry: Atoms First [1015060]

Drawing an Electron-Dot Structure

Draw an electron-dot structure for phosphine, $PH_3$ .

STRATEGY

The number of covalent bonds formed by a main-group element depends on the element’s group number. Phosphorus, a group 5A element, has five valence electrons and can achieve a valence-shell octet by forming three bonds and leaving one lone pair. Each hydrogen supplies one electron to the P-H bonds.

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$\quad \ \ \ H\\H_•^•\ \overset{••}{\underset{••}{P}}\ {}_•^• H$ Phosphine

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