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What happens when a neutron is absorbed by a nucleus of an atom of U^235?

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What happens when a neutron is absorbed by a nucleus of an atom of U^235?

(a) Mass number of atom increases

(b) One electron is let out

(c) U^236 isotope is formed

(d) Nucleus becomes unstable

This question was posed to me by my school principal while I was bunking the class.

I need to ask this question from Nuclear Fission & Nuclear Fusion topic in section Nuclear Power Plant of Energy Engineering

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Right choice is (c) U^236 isotope is formed

For explanation I would say: When a neutron is absorbed by a nucleus of an atom U^235, a U^236 isotope is formed. This isotope is highly unstable which lasts for one millionth of a second and splits into two equal parts releasing energy of 200MeV.

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