Question

20. Which of the following is the man-made radioactive
disintegration series?
(A) Thorium series
(B) Neptunium series
(C) Uranium series
(D) Actinium series
(E) None of these​

Answer 1

Answer:

(D)Actinium series

This answer is not conform

Answer 2

Answer:

b. Neptunium series is the right answer