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Question

Which of the following constitute for the mass of an atom?  


  1. Electrons, protons and neutrons 

  2. Electrons and neutrons

  3. Nucleons

  4. Electrons and protons


Solution

The correct option is C

Nucleons


Nucleons constitutes for the mass of an atom. Nucleons are  protons and neutrons that are present in Nucleus. The mass of electrons can be neglected because they are very much lighter than protons and neutrons (nearly 2000 times).  

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