Given the atomic number, number of neutrons and charge of an ion, 20, 20 and +2 respectively.Find the symbol, mass number, number of protons, number of electrons of the ion.

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Solution

Since the atomic number is given as 20, the element is calcium (Ca).
Calcium on losing two electrons will get a charge +2 and the symbol of ion: Ca⁺²
Mass number (A)= sum of protons (p) and neutrons (n) = (20+20) = 40.
As calcium lost two electrons, the total number of electrons in the calcium ion=(20-20)=18.
the number of protons = atomic number = 20.
Hence, symbol=Ca⁺² , atomic number = number of protons = 20, number of electrons = 18, mass number = 40.

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