Final answer:
One molecule of Na2SO4 consists of 7 atoms.
Step-by-step explanation:
To determine how many atoms are in one molecule of Na2SO4, also known as sodium sulfate, we simply count the number of atoms of each element in the formula. There are 2 sodium (Na) atoms, 1 sulfur (S) atom, and 4 oxygen (O) atoms. Therefore, in total, there are 7 atoms in one molecule of Na2SO4.