2-1| The Chemistry of Life

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Elements

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Substances consisting of one type of atom, cannot be broken down into simpler substances.

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Atom

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The smallest unit of an element, consisting of protons, neutrons, and electrons.

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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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Chemical Bond

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The force holding atoms together in a molecule, including ionic, covalent, and metallic bonds.

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Chemical Reaction

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A process that involves rearrangement of the molecular or ionic structure of a substance.

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Reactant

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A substance that takes part in and undergoes change during a reaction.

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Product

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A substance that is formed as the result of a chemical reaction.