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Atom

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

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Chemical property

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A characteristic of a substance that is observed during a reaction in which the chemical composition or identity of the substance is changed.

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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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Element

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

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Heterogeneous Mixture

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A mixture that has a non-uniform composition, with distinct phases or layers.

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Homogeneous Mixture

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A mixture that has a uniform composition throughout, also known as a solution.

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Matter

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Anything that has mass and takes up space.

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Metal

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An element that is typically hard, shiny, and has good electrical and thermal conductivity.

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Metalloid

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An element with properties intermediate between metals and nonmetals.

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Noble Gases

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A group of chemical elements with similar properties that are all odorless, colorless, monatomic gases with very low chemical reactivity.