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B
O-16 and O-18
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C
C-16 and N-14
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D
Rn-222 and Ra-222
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Solution
The correct option is A O-16 and O-18 Isotopes are variants of a given element with same number of protons or atomic number but different mass number.e.g. C-12, C-13, C-14 are three isotopes of element carbon with mass numbers 12, 13, 14.