identify the isotopes out of A,B,C and D?

33A17 , 40B20 , 37C17 , 38D19

1st and 3rd

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1st and 3rd

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1st and 3rd

THUMBS UP PLZ..........

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1st and 3rd because both of them have same atomic number and therefore they are isotopes
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1and 3
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Answer this question

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4228
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Identify the isotopes out of A,B,C and D- 33A17, 40B20, 37C17, 38D19
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