Chemistry, 16.12.2020 01:00 aprilkenedy12

Atom X has an atomic number 79 and an atomic mass of 197. Atom Y has an atomic number of 76 and an atomic mass of 197. Atom Z has an atomic number of 79 and an atomic mass of 200. What two atoms are considered to be the same element and why?

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Atom X has an atomic number 79 and an atomic mass of 197. Atom Y has an atomic number of 76 and an a...