15 P 30.974
Phosphorus
polyatomic nonmetal
Properties
- Atomic number
- 15
- Atomic mass
- 30.974 u
- Category
- polyatomic nonmetal
- Group
- 15
- Period
- 3
- Block
- p-block
- State (room temp)
- Solid
- Outer-shell electrons
- 5
- Electronegativity
- 2.19 (Pauling)
- Density
- 1.823 g/cm³
- Melting point
- —
- Boiling point
- —
Electron configuration
1s² 2s² 2p⁶ 3s² 3p³
Noble-gas shorthand: [Ne] 3s² 3p³
Electrons per shell: 2, 8, 5 — that's 5 in the outermost shell.
About Phosphorus
Phosphorus is a chemical element with symbol P and atomic number 15. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but due to its high reactivity, phosphorus is never found as a free element on Earth. Instead phosphorus-containing minerals are almost always present in their maximally oxidised state, as inorganic phosphate rocks.
- Discovered by Hennig Brand
- Appearance: colourless, waxy white, yellow, scarlet, red, violet, black
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.