Final answer:
A nitrogen ion will form an anion with a charge of 3-.
Step-by-step explanation:
Nitrogen's position in the periodic table (group 15) reveals that it is a nonmetal. Nonmetals form negative ions (anions). A nitrogen atom must gain three electrons to have the same number of electrons as an atom of the following noble gas, neon. Thus, a nitrogen atom will form an anion with three more electrons than protons and a charge of 3-. The symbol for the ion is N³-, and it is called a nitride ion.
Aluminum and carbon react to form an ionic compound. Aluminum forms a cation with a charge of 3+ (symbol: Al³+) and carbon forms an anion with a charge of 4- (symbol: C^4-).