A molecule of sodium sulfate has 7 atoms altogether.

Quick Scoop: How do we get 7?

The chemical formula for sodium sulfate is Na₂SO₄.

From that formula, you just read off the atoms:

  • Na₂ → 2 sodium atoms
  • S → 1 sulfur atom
  • O₄ → 4 oxygen atoms

Now add them up:

  • 2 (Na) + 1 (S) + 4 (O) = 7 atoms in total.

Think of the formula Na₂SO₄ like a “shopping list” of atoms: it tells you exactly how many of each type are in one molecule.

TL;DR: In one molecule of sodium sulfate (Na₂SO₄), there are 7 atoms altogether.

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