A U-235 nucleus bombarded by one neutron undergoes fission to Kr-89, three neutrons and another nuclide. Which nuclide is produced?
Options

Question

A U-235 nucleus bombarded by one neutron undergoes fission to Kr-89, three neutrons and another nuclide. Which nuclide is produced?

G1 Physics · Accepted Answer

Reaction: U-235 (Z = 92) + n → Kr-89 (Z = 36) + 3n + X. Mass-number conservation: 235 + 1 = 89 + 3 + A_X ⇒ A_X = 144. Charge conservation: 92 = 36 + Z_X ⇒ Z_X = 56 (Ba). Final answer: Ba-144, Option D.