To determine how many atoms are represented in the formula Na2HPO4, we need to break down the components of the formula:
- Na: 2 sodium atoms
- H: 1 hydrogen atom
- P: 1 phosphorus atom
- O: 4 oxygen atoms
Now, we add these together:
2 (Na) + 1 (H) + 1 (P) + 4 (O) = 8 atoms total.
Therefore, the correct response is eight.