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In fission, a heavy nucleus is split into two lighter ones with the liberation of __(electron, proton, or neutron)__ and __(mass or energy)__.

User Remco
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Answer:

Neutrons, energy

Step-by-step explanation:

Nuclear fission is a process by which the nucleus of a heavy atom is split into two or more daughter nuclei, releasing neutrons and energy.

Hence, nuclear fission involves the breaking up of a heavy nucleus. This breaking up may be induced by bombarding the heavy nucleus with a small particle such as a neutron. This usually leads to a chain reaction as the nucleus fragments into daughter nuclei releasing more neutrons and tremendous energy in the process.

User Moppo
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