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An ion M2+ ...

Question

An ion M²⁺ has 10 electrons and 12 neutrons, what is the atomic number and mass number of M

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Solution

Atomic number Of M= number of electronsin M
M²⁺ is formed when M loses 2 electrons, so number of electrons and atomic number of M = 10 + 2 = 12
Mass number of M = 12 + 12 = 24

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