Consider the following statements and select the correct statement(...

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Consider the following statements and select the correct statement(s).
I. The relative abundance of different isotopes differs from element to element.
II. Atomic species of the same element differing in mass are called isotopes.
III. Hydrogen has two isotopes.
(a) I only
(b) II only
(c) I and II
(d) I, II and III
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