An ion X²⁺ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

Atomic no -18, Mass no - 40, Argon

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Atomic no - 22, Mass no - 48, Titanium

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Atomic no - 20, Mass no - 40, Calcium

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None of the above

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Solution

The correct option is C
Atomic no - 20, Mass no - 40, Calcium

Originally the no. of electrons = 18+2 = 20

Thus no. of protons = 20

Atomic number = no. of protons + no. of neutrons.

Mass number = 20 + 20 = 40

The name of the element is Calcium

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