Question

Nuclear fission is best described as

Answer 1

Basically all it is  a nucleus splitting into smaller fragments   and these fragments are almost equal to half of the original mass 

Answer 2

Explanation:

Fission refers to splitting into parts.

When there is splitting of a heavy nucleus that leads to formation of two or more small nucleus along with release of energy is known as a nuclear fission reaction.

For example, $^{235}_{92}U + ^{1}_{0}n \rightarrow ^{89}_{36}Kr + ^{144}_{56}Ba + 3^{1}_{0}n + 210 MeV$