# What is the chemical formula for the ionic compound formed when elements of Ca and N react?

Apr 25, 2014

Calcium nitride is a red-brown, crystalline solid made up of calcium and nitrogen. Its chemical formula is $C {a}_{3} {N}_{2}$. The ratio will be determined by the charges of the ions.

(3 x Ca2+) = +6
(2x N3-) = -6
The net charge of the compound will be zero.

• Calcium nitride is formed along with the oxide, CaO, when calcium burns in air. It can be produced by direct reaction of the elements:
• 3 Ca + N2 → Ca3N2

Crystal structure - Cubic, cI80