Question

Please..........................

Answer 1

B is incorrect
Isotopes are atoms of the SAME element, having different mass numbers or neutrons.
Not of different elements, or different number of protons

Answer 2

heya @ User

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here option (b) is incorrect

actually, Isotopes means, Same atomic number and difft mass number ( different number of neutrons )

eg: istopes of Carbon = C 12 , C 14 , C 13

so istopes are always same elements!!

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@_@ Mavis :)