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Chemistry · Structure of atom

हिन्दी

The total number of nucleons in an atom is defined as the sum of:

  1. Number of protons and electrons
  2. Number of protons and neutrons
  3. Number of neutrons and electrons
  4. Mass number and atomic number

Correct answer · Option 2

Number of protons and neutrons

Explanation

Protons and neutrons present in the nucleus are collectively known as nucleons, so mass number \( A = \text{ protons } + \text{ neutrons} \).
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