Structure of red phosphorus is regarded as a polymer consisting of chains of P4 tetrahedral linked together by covalent bond.
On heating in air, white phosphorus changes to black P.
Yellow phosphorus is soluble in CS2 while red phosphorus is not.
P---P---P bond angle is 109∘ in red phosphorus.
Red phosphorus is formed by heating yellow phosphorus, between 240-250oC, in presence of an inert gas.