1.

Which of the following does not take place by alpha-decay

Answer»

`._(92)U^(238) rarr ._(90)Th^(234)`
`._(90)Th^(232) rarr ._(88)Ra^(238)`
`._(88)Ra^(226) rarr ._(86)Rn^(222)`
`._(83)Bi^(213) rarr ._(84)Po^(213)`

Solution :It occurs by `beta-`DECAY


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