1.

{:("i. Isotopes","(a) "S_(8)","P_(4)),("ii. Isobars","(b) "_(6)C^(13)","_(7)N^(14)),("iii. Isotones","(c) "_(1)H^(1)","_(1)H^(2)","_(1)H^(3)),("iv. Polyatomic molecule","(d) "_(18)Ar^(40)","_(20)Ca^(40)):}

Answer»

SOLUTION :`i-c,ii-d,iii-b,iv-a`


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