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Question

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


  1. Atomic number -18, Mass number - 40, Argon

  2. Atomic number - 22, Mass number - 48, Titanium

  3. Atomic number - 20, Mass number - 40, Calcium

  4. Atomic number - 40, Mass number - 20, Calcium


Solution

The correct option is C

Atomic number - 20, Mass number - 40, Calcium


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

Thus, no. of protons = 20

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

Mass number = 20 + 20 = 40

The name of the element is Calcium

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