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All terms in this list:

Element: One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based.

Atomic Number: The number, equal to the number of protons in an atom that determines its chemical properties. Symbol: Z

Isotopes: Plural form of isotope.

Mass Number: The total number of protons and neutrons in an atomic nucleus.

Atomic Mass: The mass of an atom expressed in atomic mass units.

Metals: Plural form of metal.

Nonmetals: Plural form of nonmetal.

Metalloids: Plural form of metalloid.

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