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QUESTION

# 5. Lithium nitride has the chemical formula Li_3N. Rubidium is in the same chemical family as lithium. What is the formula of rubidium nitride?

We would assume Rb_3N.

Rubidium, an alkali metal, commonly forms Rb^+ salts, just as lithium commonly forms Li^+ salts. We would assume that the formula of rubidium nitride (if it exists!) is Rb_3N.