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प्रश्न
An isotope of uranium is 92Y238, i.e., it has mass number 235 and atomic number 92.
Find the number of protons and neutrons in its nucleus.
उत्तर
Atomic mass = Number of protons + Number of neutrons
or 235 = 92 + Number of neutrons
∴ Number of neutrons = 235 - 92 = 143
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\[\ce{_92U^235 + _0n^1 -> _56Ba^{\underline{\phantom{....}}} + \underline{\phantom{..}}Kr^92 + 3 _0n^1}\]
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