Which of the following are evidences for the existence of neutrons in an atom? (A) The ratio of ...

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Which of the following are evidences for the existence of neutrons in an atom?
(A) The ratio of the charge to the mass of atom's nucleus is smaller than that of a hydrogen nucleus
(B) An atom is always electrically neutral
(C) Isotopes are present
(D) Some atoms are radioactive in nature
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