How many atoms are in copper sulphate CuSO4?
Copper on the Periodic Table of Elements is Cu. Copper is 1 atom.
Sulphur on the Periodic Table of Elements is S. Sulphur is 1 atom.
Oxygen on the Periodic Table of Elements is O. Since there is a 4 next to the O, it's 4 atoms of Oxygen.
1 Atom of Copper + 1 Atom of Sulphate + 4 Atoms of Oxygen = 6 Atoms.
First it helps to know the chemical formula: CuSO4 The number in the subscripts indicate the number of atoms of an element in the compound. If there is no number, then it is implied that there is only one atom. So, there is one atom of copper, one atom of sulfur, and four atoms of oxygen; for a total of six atoms.