An empirical formula: 1. gives the relative number of ions of each element per formula unit. 2. gives the number of ions of each element per formula unit. 3. uses lines to represent covalent bonds and shows how atoms in a molecule connect or bond to each other. 4. gives the relative number of atoms of each element per formula unit.5. gives the actual number of atoms of each element per formula unit.

4

Explanation:

It gives the lowest ratio of the number of atoms of each element per formula unit. This is usually derived by dividing common multiples of the molecular formula thereby reducing the value.

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2b2t

explanation:

2b2t