Basic Chemistry Terms

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Atom

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The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.

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Element

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A pure substance consisting of only one type of atom.

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Compound

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A substance formed when two or more chemical elements are chemically bonded together.

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Molecule

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A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound.

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Substance

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A form of matter that has a constant chemical composition and characteristic properties.

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Mass

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A measure of the amount of matter in an object, typically in kilograms or grams.

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Volume

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The amount of space that a substance or object occupies.

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Density

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The mass of a substance per unit volume.

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Physical Property

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A characteristic of matter that can be observed or measured without changing its composition.

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Chemical Property

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A characteristic of a substance that is observed during a chemical reaction.