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प्रश्न
Define the term ‘mass number’ of an atom.
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उत्तर
Mass number of an element is equal to the sum of protons and neutrons in the nucleus of the atom.
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| Column A | Column B | ||
| 1. | Mass of proton | a. | +1 |
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| 4. | Charge of proton | d. | 1.67 x 10-24g |
