Chemistry deals with Matter, its composition, properties and behavior. Atoms are the small bits of Matter and learning atoms, elements, compounds and mixtures forms integral part of learning Chemistry. Elements are substances made from particular types of atoms. For example, hydrogen is an element made from atoms having one electron and one proton. Most of the atoms in hydrogen have no neutron, some of them have one neutron and some have more. These different forms of hydrogen are called isotopes. All isotopes in an element have the same number of protons but they may have different numbers of neutrons.
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