The chemical formula for nitrogen is N. It is a diatomic gas, meaning it exists as two nitrogen atoms bonded together. Nitrogen makes up approximately 78% of the Earth's atmosphere.

The chemical formula for hydronium is H3O+. It is a polyatomic ion that forms when a hydrogen ion (H+) combines with a water molecule (H2O). Hydronium ions are present in acidic solutions and play a crucial role in many chemical reactions.