1.

Identify the pairs which are not of isotopes ?

Answer»

`._(16)^(12)X, ._(6)^(13)Y`
`._(17)^(35)X, ._(17)^(37)Y`
`._(16)^(14)X, ._(7)^(14)Y`
`._(4)^(8)X, ._(5)^(8)Y`

Solution :(c) and (d) are not isotopes because in each, atom have different atomic number


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