Front

Element

Back

substance with identical atoms

Front

Atom

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Smallest particle of an element that retains its properties.

Front

Nucleus

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Small, positively charged center of the atom.

Front

Particles in the nucleus with a charge of 1+

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Proton

Front

Protons and neutrons are made of smaller particles called...

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quark

Front

Area around an atom's nucleus where electrons are likely found

Back

electron cloud

Front

Amount of matter in an object

Back

mass

Front

Protons in an atom's nucleus equal its:

Back

atomic number

Front

Isotope

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Atoms of the same element with different numbers of neutrons.

Front

Mass number

Back

Sum of protons and neutrons in an atom's nucleus.