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प्रश्न
A certain nucleus has a mass number 20 and atomic number 9. Find the number of neutrons and protons present in it.
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उत्तर
(i) Number of neutrons = Mass number – Atomic number
= 20 – 9 = 11
(ii) Number of protons = Atomic number = 9.
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संबंधित प्रश्न
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