which feature of nuclear fission reactions allows these reactions to take place in a chain reaction?\no…

which feature of nuclear fission reactions allows these reactions to take place in a chain reaction?\no thermal energy is released and heats up the reactants.\no more smaller atoms form that can undergo fission.\no a larger atom is formed, which can then be split.\no neutrons start the reaction and are released during it.

which feature of nuclear fission reactions allows these reactions to take place in a chain reaction?\no thermal energy is released and heats up the reactants.\no more smaller atoms form that can undergo fission.\no a larger atom is formed, which can then be split.\no neutrons 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, continuing the chain. Thermal energy release doesn't directly cause the chain - reaction mechanism. Smaller atoms formed are typically stable and don't undergo further fission in the context of the chain - reaction initiation. Fission is about splitting a large atom, not forming a larger one for the chain - reaction to occur.

Answer:

D. Neutrons start the reaction and are released during it.