Atoms and molecules

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10 Terms

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Atom

The smallest unit of an element which has all of its properties

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Molecule

Group of two or more atoms held together by chemical bonds

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Proton

Subatomic particle with a positive electric charge

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Atomic number

Number of protons in the nucleus of an atom

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Mass number

Sum of the number of protons and number of neutrons in an atom

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Diatomic molecule

Molecule containing two atoms

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Triatomic molecule

Molecule containing three atoms

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Polyatomic molecule

Molecule with four or more atoms

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Chemical change

Two or more different types of atoms chemically bond together to form a molecule

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