1.

Identify the pairs which are not of isotopes? (1) ""_(6)^(12) X,_(3)^(16) (2) ""_(17)^(35) X,_(17)^(37) (3) ""_(6)^(14) X,_(7)^(14) (4) ""_(4)^(8) X,_(5)^(8)Y

Answer»

`1&2`
`2&4`
`3&4`
`1&4`

ANSWER :C


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