* Electronegativity Difference: Phosphorus (P) and hydrogen (H) have relatively similar electronegativity values. The difference is not large enough to create a significant ionic character in the bond.

* Sharing of Electrons: In PH₃, phosphorus shares its electrons with the three hydrogen atoms to form covalent bonds. This sharing of electrons results in a stable molecule.

Important Note: While the bond between phosphorus and hydrogen is primarily covalent, it does have a small degree of polarity due to the slight electronegativity difference. This means that the phosphorus atom has a slightly negative charge and the hydrogen atoms have a slightly positive charge.