1.

Which of the following pairs are isodiapheric pairs ?

Answer»

`""_(29) Cu^(65)` and `""_(24) Cr^(55)`
`""_(29) Cu^(65)` and `""_(24) Cr^(52)`
`""_(92) U^(235)` and `""_(90) Th^(231)`
`""_(92) U^(238)` and `""_(90) Th^(231)`

Solution :I.T.N.O.= (A-2 Z) `implies` same
(a) `65 - 2 xx 29 = 65-58 = 7`
`55-2 xx 24 = 55 - 48 = 7`
(B)`52 -2 xx 24 = 52 - 48 = 4`
(c) `235 - 2 xx 92 = 235 - 184 = 51`
`231 - 2 xx 90 = 231 - 180 = 51`
(d) `238 - 2 xx 92 = 238 - 184 = 54`
`231 - 2 xx90 = 5`


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