Chem_Y9_S1

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Atom

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The smallest unit of matter that still has the properties of an element.

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Element

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A pure substance made of only one type of atom.

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Compound

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A substance made when two or more elements are chemically joined.

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Mixture

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A combination of substances that are not chemically joined and can be separated.

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Crystal lattice

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A solid structure where atoms or ions are arranged in a repeating pattern.

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Atomic number

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The number of protons in an atom, which also tells you the element.

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Atomic mass

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The total number of protons and neutrons in an atom.

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Proton

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A part of the atom with a positive charge found in the nucleus.

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Neutron

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A part of the atom with no charge found in the nucleus.

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Electron

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A part of the atom with a negative charge that moves around the nucleus.