"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 AMU?", "1 AMU" "vertical columns on periodic table", "groups" "horizontal rows on periodic table", "periods"
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