An ion M2+contains 10 electrons and 12 neutrons.What are the mass number and atomic number of the element M?Name the element.
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If M2+ has 10 electrons it means the neutral atom M has 12 electrons.
That's because it loses 2 electrons to form an ion with charge positive 2
A neutral atom with 12 electrons must have12 protons
∴ Mass number of M = 12+12 = 24 (Sum no. of Neutrons and protons)
Atomic number of M = 12 (No. of protons)
The element is Magnesium (Mg)
That's because it loses 2 electrons to form an ion with charge positive 2
A neutral atom with 12 electrons must have12 protons
∴ Mass number of M = 12+12 = 24 (Sum no. of Neutrons and protons)
Atomic number of M = 12 (No. of protons)
The element is Magnesium (Mg)
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