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The valency of phosphorus is

June 1, 2025 by rawan239

The valency of phosphorus is

2, 3

3, 4

4, 5

3, 5

This question was previously asked in

UPSC CDS-2 – 2020

Download PDF Attempt Online

Phosphorus commonly exhibits valencies of 3 and 5.

Phosphorus is in Group 15 (VA). In compounds like PH₃ or PCl₃, phosphorus has a valency of 3, using its three unpaired p-electrons for bonding. Due to the presence of vacant d-orbitals, phosphorus can expand its valence shell and form five covalent bonds, as seen in compounds like PCl₅ or P₂O₅, where its valency is 5.

Phosphorus can also exhibit other oxidation states and valencies in specific compounds, but 3 and 5 are the most common valencies.

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