20. The atomic number is equivalent to which of the following ?
(a) The number of neutrons in the atom (b) The number of protons in the atom (c) The number of nucleons in the atom (d) The number of ?–particles in the atom
Answer
Answer : (b)
Explanation
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Atomic Physics » Exercise - 113. If the radius of a nucleus of mass number 3 is R. then the radius of a nucleus of mass number 81 is : (a) 3R (b) 9R (c) 27R (d) 81R