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Question

Atomicity of white or yellow phosphorus is 4 and it forms a molecule P4. Calculate the value of the expression x.yz, where:
x: Total number of vertex angles in P4 molecule
y: Total number of lone pairs in P4 molecule
z: Total number of PP bonds in P4 molecule

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Solution

P4 molecule is tetrahedron.
Total number of vertex angleS, x = 12 (each P makes 3 angles each of 60o)
Total number of lone pairs, y = 4
Total number of PP bonds, z = 6
so, x.yz=12×46=8

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