alleryWhen a neutron is bombarded on a Uranium-235 atom, it first absorbs the neutron and converts into which unstable isotope before undergoing fission?
AUranium-234
BPlutonium-239
CBarium-235
DUranium-236
Answer & Solution
Correct answer: D. Uranium-236
1. A neutron strikes a Uranium-235 atom and is absorbed by it.
2. Absorbing one neutron raises the mass number by one, giving Uranium-236.
3. Uranium-236 is extremely unstable and splits into barium and krypton.
4. Barium (option C) is a fission product, not the intermediate isotope, so it is ruled out.
5. Plutonium (option B) is a different element, not formed by simple neutron capture here, so it is wrong.
6. So the unstable isotope formed is Uranium-236.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 5 "Towards Green Energy", p.59_
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