Commonly used chemical formulas, such as: H2O2, N2Cl2, HCI, H2O, CO2, SO4HNO3, etc.
Atoms are uncharged particles. Symbolic representation of common elements. Such as: N 2N O 3O Fe Cu K, etc.
Ions are atoms with dots, often in the upper right corner of element symbols, indicating the number of charges carried by ions.
Such as: Na+ Ca2+ S2- SO42- OH- 2O2- 2OH- etc.
Whether it's molecules, atoms or ions, it's obvious from the way the symbols are written!
Talk about a topic you don't understand. The difference between them is simple.
You must first remember that there are at least the first 20 elements in the periodic table. Atoms are elements in a single periodic table, such as a single hydrogen atom or a single oxygen atom. This is an atom.
Molecules are made up of atoms, which is the basic unit of matter. Two H atoms are called H molecules, and H molecules constitute hydrogen.
Ions must be charged, such as H+(+ is a superscript), that is, this ion, that is, the one with the+/-sign on the upper right, means charged, and the number behind it is the specific amount of charge.