Basic Atomic Structure and History

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Atoms

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Smallest piece of matter that is still considered an element.

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Electron

Back

Negatively charged subatomic particle that circles the nucleus of an atom.

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Proton

Back

Positively charged subatomic particle that is a part of the nucleus.

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Neutron

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Neutral subatomic particle that is a part of the nucleus.

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Nucleus

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Center of the atom that is made up of protons and neutrons.

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Atomic Number

Back

The # of protons found in an atom of a specific element.

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Atomic Mass

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The # of protons and neutrons found in an atom of a specific element.

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Isotope

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Different versions of an element that have the same # of protons, BUT different # of neutrons.

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Quark

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Tiny particles that make up protons and neutrons.

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Ion

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An atom that has gained or lost electrons, so no longer the same # as protons, and therefore have a charge.