Correct Answer: Tetra-atomic

Solution : The correct option is Tetra-atomic .

Phosphorus exists in a tetra-atomic form as P4 molecules. In this molecular form, four phosphorus atoms are bonded together in a tetrahedral arrangement. The P4 molecule is the most stable and common allotrope of phosphorus under normal conditions. Each phosphorus atom in the P4 molecule forms three single bonds with other phosphorus atoms, resulting in a tetrahedral structure with a characteristic tetra-atomic nature.