It has the formula PH3. The phosphorus is bonded to three hydrogen atoms and has a lone pair of electrons. Since hydrogen and phosphorus are equal in electronegativity, meaning that they attract the shared pairs of electrons the same amount, the bonding electrons are shared equally making the covalent bonds non-polar.

Is phosphine a covalent compound?

The atoms in the phosphine molecule are connected by single covalent bonds. A covalent bond is formed when atoms share electrons.

What type of bond is phosphine?

Phosphine is the best example of a polar molecule having non-polar bonds. As with three hydrogen bonds and a lone pair, hydrogen and phosphorus are equal in electronegativity values. This means they attract shared pairs of electrons in the same range.