Question

Atomicity of white or yellow phosphorus is 4 and it is represented as $P_4$ molecule, calculate the value of expression $\frac{x.y}{z}$ regarding this molecule.
Where, x: Total number of vertex angles in $P_4$ molecule
y: Total number of lone pairs in $P_4$ molecule
z: Total number of P---P bonds in $P_4$ molecule.

Answer 1

Atomicity of white or yellow phosphorus is 4 and it is represented as $P_4$ molecule.

Where x: Total number of vertex angles in $P_4$ molecule $=12$.

y : Total number of lone pairs in $P_4$ molecule $=4$.

z : Total number of P---P bonds in $P_4$ molecule $=6$.

Now,

$\frac{x.y}{z}=\frac{12\times 4}{6}=8$

Thus, the value of expression $\frac{x.y}{z}$ regarding this molecule is 8.