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""^(238)U(IIIB) changes to ""^(234)Th by...

`""^(238)U(IIIB)` changes to `""^(234)Th` by emission of `alpha`-particle. Daughter element will be in
(1) IIIB (2) IB (3) VB (4) HA

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The correct Answer is:
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Since, both `""_(92)^(2238)U and ""_(90)^(234)U` are f-block elements, hence both belong to III B group.
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How many alpha and beta -particles are emitted in the transformation ""_(92)^(238)U rarr ""_(92)^(234)U

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