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Actinides
an element in the second row of the rare earth elements in the periodic table
Avery
Alkali Metal
an elementint in group 1 of the periodic table
Atom
the basic building block of most of the matter around us; the smallest mater particle of an element that has all properties of that element
Atomic Mass
a measure of an atoms mass that is equal to the number of protons and neutrons in the atoms nucleus
Atomic Number
the number of protons in the nucleus of an atom
Compound
a pure substance that forms when two or more elements join chemicallyh in a fixed proportion
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