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Lithium nitride has the chemical formula LI3N Rubidium is in the same chemical family as lithium. What is the formula
of rubidium nitride?
o Rb3N
O RON3
Rb2N3
CRON
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The answer to your question is   Rb₃N

Explanation:

Data

Lithium Nitride = Li₃N

Rubidium Nitride = ?

Process

1.- Both Lithium and Rubidium are placed in group lA of the periodic table, which means that their valence number if + 1.

2.- Nitrogen is placed in group VA, which means that its oxidation number is -3.

3.- Write the formula and interchange the oxidation numbers.

                                  Rb⁺¹   N⁻³

                                  Rb₃N₁

But number one is not necessary to write it.

                                  Rb₃N

what's the