( a ) ( i ) Distinguish between nuclear fission and nuclear fusion. ( ii ) State ONE condition necessary for nuclear fusion to occur. ( b ) Consider the following nuclear reaction: ²³⁵₉₂U + ¹₀n → ¹⁴¹₅₆Ba + ⁹²₃₆Kr + x ¹₀n ( i ) Determine the value of x. ( ii ) Identify the type of nuclear reaction represented above. ( iii ) Calculate the energy released in the reaction, given the following data: Mass of ²³⁵₉₂U = 235.0439 u; Mass of ¹₀n = 1.0087 u; Mass of ¹⁴¹₅₆Ba = 140.9144 u; Mass of ⁹²₃₆Kr = 91.9262 u. [1 u = 931.5 MeV/c²] ( c ) ( i ) What is meant by 'binding energy' of a nucleus? ( ii ) State how binding energy per nucleon varies across the periodic table and explain what this implies about the stability of nuclei.