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the first one is the pair of isotopes.
Because a pair is said to be isotope. if the pair has same atomic number & different atomic weights. so In first pair the atomic numbers are same .
But in the second pair the atomic numbers are different .
:-)Hope it helps u.
Because a pair is said to be isotope. if the pair has same atomic number & different atomic weights. so In first pair the atomic numbers are same .
But in the second pair the atomic numbers are different .
:-)Hope it helps u.
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