Phosphorus

15 silicon ← phosphorus → sulfur N ↑ P ↓ As periodic table General Name, Symbol, Number phosphorus, P, 15 Chemical series nonmetals Group, Period, Block 15, 3, p Appearance waxy white/ red/ black/ colorless Atomic mass 30.973762(2) g/mol Electron configuration [Ne] 3s2 3p3 Electrons per shell 2, 8, 5 Physical properties Phase solid Density (near r.t.) (white) 1.823 g·cm−3 Density (near r.t.) (red) 2.34 g·cm−3 Density (near r.t.) (bla ...