* Subscripts indicate the number of atoms:
* Mg₂ means there are 2 magnesium (Mg) atoms.
* Si means there is 1 silicon (Si) atom.
* O₄ means there are 4 oxygen (O) atoms.
* Total atoms: 2 + 1 + 4 = 7 atoms
Therefore, there are 7 atoms in one molecule of Mg₂SiO₄.