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Why is the atomic mass of copper not exactly equal to 64 midway between the mass numbers of copper-63 and copper-65?
Wiki User
∙ 11y ago
Because copper has isotopes. All Copper atoms have exactly the same number of protons, but not all of them have the same number of neutrons. The ones with different numbers of neutrons are known as isotopes. A given sample of Copper will contain various amounts of each of its isotopes. The Atomic Mass (weight) is an average weight, based on the percentages of the isotopes
Wiki User
∙ 11y ago
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An atom with 17 protons is chlorine. (It is unnecessary to say "exactly" because the number of protons can only be whole numbers.)
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