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Electrons are on the outside rings of an atom. neutrons and protons are together in the nucleus of the atom. There is always the same number of protons and electrons in an atom, equal to the atomic number of the element. The amount of neutrons varies, even between atoms of the same number, these varieties of an element are called isotopes.

If the amount of protons and electrons varies, it is called an ion, and the chemical number is still equal to the amount of protons.

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