Yellow Phosphorus

Specifications :

Physical properties
Phase solid
Density near r.t. white: 1.823 g·cm3
red: ‰2.2“2.34 g·cm3
violet: 2.36 g·cm3
black: 2.69 g·cm3
Heat of fusion white: 0.66 kJ·mol1
Heat of vapourisation white: 51.9 kJ·mol1
Molar heat capacity white: 23.824 J·mol1·K’1
vapour (white)

P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 279 307 342 388 453 549
vapour pressure (red, b.p. 431°C)

P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 455 489 529 576 635 704
Atomic properties
Oxidation states 5, 4, 3, 2, 1, 1, ’2, ’3 (a mildly acidic oxide)
Electronegativity Paulin scale: 2.19
Ionisation energies 1st: 1011.8 kJ·mol1
2nd: 1907 kJ·mol’1
3rd: 2914.1 kJ·mol1
(more)
Covalent radius 107±3 pm
Van der Waals radius 180 pm