Phosphorus

Phosphorus is a mineral that makes up 1% of a person’s total body weight. It is the second most abundant mineral in the body. It is present in every cell of the body. Most of the phosphorus in the body is found in the bones and teeth.
Symbol: P
Atomic number: 15
Electron configuration: [Ne] 3s²3p³
Atomic mass: 30.973762 u
Electrons per shell: 2, 8, 5
Electronegativity: 2.19
ref: medlineplus & wikipedia