Explanation
Artificial transmutation conversion from one element to another by artificial means by bombardment with some fundamental particles.
Control rods – Cadmium – absorbs neutron.
Graphite is used as moderator.
Group IV A means Group 14. Po will be in Group 16 i.e. VI A.
U–238 occurs in nature along with U–235.
Increase of Z by 1 with no change in A means emission of one β − particle . Decrease in Z by 2 and A by 4 means emission of one α − particle. No change in Z and A means emission of γ − rays.
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