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Question

An element has 10 electrons and 12 neutrons. What is the mass number of this element?


  1. 32

  2. 22

  3. 12

  4. 10


Solution

The correct option is B

22


Since an atom is neutral we can conclude that the given atom has 10 protons as it has 10 electrons.

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

Therefore the mass number of this element = 10 + 12 = 22

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