The chemical formula for sodium nitride is Na3N. It is an alkali metal nitride. A molecule of sodium nitride is made up of four atoms. These atoms include three atoms of sodium and one atom of nitrogen. The normal phase of sodium nitride is solid. At room temperature, it is a crystalline solid. Below room temperature, it turns from crystalline solid to amorphous solid. Moreover, sodium nitride decomposes into its components at high temperature or near 90 degrees Celsius.