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Matter

Back

Anything that takes up space and has matter

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Element

Back

A pure substance that is distinguished from all other matter by the fact that it cannot be created or broken down by ordinary chemical means

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Compound

Back

A substance composed of two or more elements joined by chemical bonds

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Atom

Back

the smallest quantity of an element that retains the unique properties of that element

Front

Proton, neutron, electron

Back

Atoms that are made up of even smaller particles

Front

Atomic Number

Back

The number of protons in the nucleus of the atom, identifies the element

Front

Mass Number

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The sum of the number of protons and neutrons in its nucleus

Front

Isotope

Back

one of the different forms of an element, distinguished from one another by different numbers of neutrons

Front

Electron Shell

Back

a layer of electrons that encircle the nucleus at a distinct energy level

Front

Valence Shell

Back

Atoms outermost electron shell