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ATOM

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The basic unit of a chemical element.

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SOLID

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A state of matter characterized by structural rigidity and resistance to changes of shape or volume.

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LIQUID

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A state of matter that has a definite volume but no definite shape.

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GAS

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A state of matter that has no fixed shape and expands to fill its container.

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PURE SUBSTANCES

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Materials that are composed of only one type of particle.

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ELEMENTS

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Substances that cannot be broken down into simpler substances by chemical means.

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COMPOUNDS

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Substances formed when two or more elements are chemically bonded together.