Question

Which condition is necessary for fission to occur?

heavy, unstable isotopes

high temperatures

light isotopes

excess protons

Answer 1

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Answer 2

Nuclear fission is the case when an unstable high atomic mass isotope breaks to form two or more stable, lighter ones. Look at the following link more info and detailed comparison between nuclear fission and fusion.

http://www.diffen.com/difference/Nuclear_Fission_vs_Nuclear_Fusion#Conditions_for_fission_and_fusion