which feature of nuclear fission reactions allows these reactions to take place in a chain…

which feature of nuclear fission reactions allows these reactions to take place in a chain reaction?\nthermal energy is released and heats up the reactants.\nmore smaller atoms form that can undergo fission.\na larger atom is formed, which can then be split.\nneutrons start the reaction and are released during it.

which feature of nuclear fission reactions allows these reactions to take place in a chain reaction?\nthermal energy is released and heats up the reactants.\nmore smaller atoms form that can undergo fission.\na larger atom is formed, which can then be split.\nneutrons start the reaction and are released during it.

Answer

Brief Explanations:

In a nuclear fission chain - reaction, a neutron initiates the fission of a heavy - nucleus. During the fission process, more neutrons are released, which can go on to cause fission in other nuclei, sustaining the chain - reaction. Thermal energy release doesn't directly enable the chain - reaction. Smaller atoms formed are not the key to the chain - reaction process, and a larger atom is not formed in fission for the chain - reaction to occur.

Answer:

Neutrons start the reaction and are released during it.