Chemistry Concepts

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Proton

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A positively charged particle found in the nucleus of an atom.

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Electron

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A negatively charged particle that orbits the nucleus of an atom.

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Molecule

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Two or more atoms bonded together.

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Atomic Model

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A representation of the structure of an atom.

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Compound

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A substance made of two or more different elements bonded together.

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Ion

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An atom or molecule with a net electric charge due to the loss or gain of electrons.

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Ionic Bond

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A chemical bond formed between two ions with opposite charges.

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Covalent Bond

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A chemical bond formed by the sharing of electron pairs between atoms.

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Physical Reaction

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A change affecting the form of a chemical substance, but not its chemical composition.

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Chemical Reaction

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