AP Chemistry Vocab Review Part 3

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Atom

Back

The smallest unit of an element that retains its chemical properties.

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Proton

Back

A positively charged subatomic particle in the nucleus.

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Neutron

Back

A neutrally charged subatomic particle in the nucleus.

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Electron

Back

A negatively charged subatomic particle in orbitals around the nucleus.

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Atomic Number

Back

The number of protons in an atom, which defines the element.

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Mass Number

Back

The sum of protons and neutrons in the nucleus of an atom.

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Isotope

Back

Atoms of the same element with different numbers of neutrons.

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Ion

Back

An atom or molecule that has gained or lost electrons, resulting in a charge.

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Cation

Back

A positively charged ion that has lost electrons.

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Anion

Back

A negatively charged ion that has gained electrons.