If 3 neutrons and 89 Se are produced from the nuclear fission of 235 U, the other fission product is Cesium-143.
Nuclear fission is a nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.
According to this question, a radioactive element called Uranium-235 undergoes nuclear fission to produce 3 neutrons and selenium-89.
Neutron has the following chemical symbol: 1/0 n, hence, three neutrons will be 3/0n.
Therefore, the mass number of the other fission product will be 235 - 89 - 3 = 143, which is a radioactive element called Cesium.
Therefore, if 3 neutrons and 89 Se are produced from the nuclear fission of 235 U, the other fission product is Cesium-143.
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