Chem Vocab 1.2 Structure of an Atom

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7 Terms

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Nucleus

center of an atom that contains protons and neutrons

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Atom

The smallest particle of an element that still has that element’s properties

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Proton

A subatomic particle with a positive charge (+1) found in the nucleus; has a mass of 1 amu.

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Neutron

A subatomic particle with no charge (neutral) found in the nucleus; has a mass of 1 amu.

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Electron

A subatomic particle with a negative charge (–1) that moves around the nucleus; has a mass of about 0 amu.

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Ion

An atom that has gained or lost electrons, giving it a positive or negative charge

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Atomic Number

The number of protons in the nucleus of an atom; it identifies the element and is located on the periodic table