* Break down the formula: 4SO2 represents 4 molecules of sulfur dioxide (SO2).

* Count the atoms per molecule: Each SO2 molecule contains 1 sulfur atom (S) and 2 oxygen atoms (O).

* Calculate the total:

* Sulfur atoms: 4 molecules * 1 S atom/molecule = 4 S atoms

* Oxygen atoms: 4 molecules * 2 O atoms/molecule = 8 O atoms

* Total atoms: 4 S atoms + 8 O atoms = 12 atoms

Therefore, there are 12 atoms in 4SO2.