Atomic Theory Vocabulary

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Proton

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A subatomic particle found in the nucleus of an atom, with a positive electric charge.

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Neutron

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A subatomic particle found in the nucleus of an atom, with no electric charge.

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Electron

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A subatomic particle with a negative electric charge, found in the electron cloud surrounding the nucleus.

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Electron Cloud

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The region around the nucleus of an atom where electrons are likely to be found.

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Atomic Number

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The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

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Atomic Mass

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The mass of an atom, typically expressed in atomic mass units (amu), approximately equivalent to the number of protons and neutrons in the atom.

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Frequency

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The number of occurrences of a repeating event per unit of time, often used in the context of waves, such as light or sound.

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Electric Charge

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A physical property of matter that causes it to experience a force when placed in an electromagnetic field. There are two types of electric charges: positive and negative.

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John Dalton

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An English chemist, physicist, and meteorologist who is best known for introducing the atomic theory into chemistry.

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J.J. Thompson

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An English physicist who discovered the electron and proposed the plum pudding model of the atom.