Rb3N is an ionic compound. Rubidium (Rb) is a metal and nitrogen (N) is a nonmetal, so they form an ionic bond through the transfer of electrons.
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It is ionic
Bases can be both ionic and covalent in nature.
The ionic formula for rubidium ion (Rb+) and nitride ion (N3-) would be Rb3N. The charges on the ions must balance out to create a neutral compound.
Br2 is a covalent compound. It consists of two bromine atoms sharing electrons to form a covalent bond.
Calcium phosphate has both ionic and covalent bonds. The bond between calcium and phosphate is predominantly ionic, while the bonds within the phosphate ion itself are covalent.