Chemistry - Atoms and Elements

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8 Terms

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atom

smallest part of an element that can still be recognised as that element

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isotope

atom with a different number of neutrons

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mass number

number of protons + number of neutrons

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atomic number

number of protons

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element

substance that is made up of only one kind of atom

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compound

substance that contains atoms of two or more different elements, chemically joined together

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mixture

different substances that are not chemically joined to each other

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molecule

two or more atoms chemically bonded together