Question

how many chromium atoms are present in one formula unit of sodium chromate? na₂cro₄ 4 atoms 1 atom 2 atoms 7 atoms

Explanation:

The formula of sodium chromate is given as $\text{Na}_2\text{CrO}_4$. In a chemical formula, the subscript after an element symbol indicates the number of atoms of that element in one formula unit. For chromium (Cr), there is no explicit subscript, which means the subscript is 1 by default.

Answer:

1 atom