"isotopes", "Atoms of the same element that have a different number of neutrons(examples are Carbon-14 and Uranium-235)" "atomic number", "Usually found written above the element's chemical symbol on the periodic table, this number represents the number of protons in one atom of that element." "proton and neutron<br /> AMU?", "1 AMU" "vertical columns on periodic table", "groups" "horizontal rows on periodic table", "periods"
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