On its own nitrogen typically forms anions like nitride (N3-) or azide (N3-). However, in the presence of protons (H+), they can also form amide (NH2-) or an ammonium cation (NH4+).
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Cesium is a cation, meaning it is a positively charged ion. It forms the Cs+ cation when it loses an electron.
The chemical formula for calcium nitride is Ca3N2, not CaN2. The formula indicates that each calcium atom bonds with three nitrogen atoms. The subscript numbers are used to show the ratio of elements in the compound.
Chloride is an anion. It carries a negative charge due to the gain of an electron.
The cation for sodium fluoride is Na+ (sodium ion).
Cesium is a cation, as it has a positive charge due to losing an electron.