Atom - The smallest unit of an element that has the chemical identity of the element., Element - A substance made up of 1 type of atoms., Molecule - 2 or more atoms chemically joined ( same or different ), Compound - 2 or more different types of atoms chemically joined., Periodic table - A list of elements according to their atomic number., Nucleus - The centre of an atom that contains protons and neutrons, Electron - Negatively-charged subatomic particle, Proton - Positively-charged subatomic particle,

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