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An ion M^(2+) contains 10 electrons and ...

An ion `M^(2+)` contains 10 electrons and 12 neutrons .What is the atomic number and mass number the element M? Name the element.

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No. of electrons in M* ion = 10 Atomic number of atom M = 10 + 2 = 12 No. of protons in atom M = 12 Mass number of atom M = No. of protons + No. of neutrons = 12 + 12 = 24 The element M with atomic number 12 is magnesium (Mg).
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