(A) An $\alpha$-particle is a helium nucleus,represented as $_{2}He^{4}$.When a radioactive nucleus emits an $\alpha$-particle,its mass number decreas

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(A) An $\alpha$-particle is a helium nucleus,represented as $_{2}He^{4}$.When a radioactive nucleus emits an $\alpha$-particle,its mass number decreases by $4$ and its atomic number decreases by $2$.The nuclear reaction is: $_{92}U^{238} \to _{90}Th^{234} + _{2}He^{4}$.Thus,the product has a mass number of $234$ and an atomic number of $90$.

Class 12 Chemistry Nuclear Chemistry Radioactivity and a,b and g rays

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If uranium (mass number $238$ and atomic number $92$) emits an $\alpha$-particle,what are the mass number and atomic number of the product?

IIT 1981 All IIT

A
$234, 90$
B
$236, 92$
C
$238, 90$
D
$236, 90$

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Radioactivity and a,b and g rays

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If uranium (mass number $238$ and atomic number $92$) emits an $\alpha$-particle,what are the mass number and atomic number of the product?

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