Just a general definition of each and how to distinguish them from each other.
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Atom - smallest particle of an element.
Molecule - smallest particle of a compound, assuming a compound is two or more atoms chemically joined together. (Therefore, it is possible to have a molecule of an element, as in the diatomic molecules of H2, N2, O2, F2, Cl2, Br2 and I2, and even P4 and S8.)
Particle - a unique entity
Molecule - smallest particle of a compound, assuming a compound is two or more atoms chemically joined together. (Therefore, it is possible to have a molecule of an element, as in the diatomic molecules of H2, N2, O2, F2, Cl2, Br2 and I2, and even P4 and S8.)
Particle - a unique entity
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Particle can be something small like a grain of sand. You would describe very small pieces of matter as particulate in solution. A molecule is a combination of atoms such as sodium chloride (NaCl) or methane (CH4). An atom is the smallest part of a molecule and would be something like a sodium atom Na, or a hydrogen atom H, or a carbon atom C. Atoms are made of smaller parts, but that is probably unimportant.