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Calculating the Atomic weight of an Element from l Abundances The atomic weight of copper, Cu, is listed as 63.546. Which of the following statements are untrue Copper is a mixture of at least two isotopes. The dominant isotopes of Cu must be^63Cu and^64Cu. Not all neutral atoms of copper have the same number of electrons. The number of electrons in the copper atoms is independent of atomic mass. All the copper atoms have 29 protons in the nucleus. All neutral atoms of copper must have 29 protons, regardless of the number of neutrons in the nucleus.