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A uranium nucleus U-238 of atomic number...

A uranium nucleus `U-238` of atomic number`92` emits two `alpha`- particles and two `beta`-particles and trasnforms into a thorium nucleus. What is the mass number and atomic number of the thorium nucleus so produced?

Text Solution

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Alpha particle is `._2He^4` and Beta particles is `._(-1)e^0`.
`:.` on emission of `2alpha` and `2beta` particles,
mass no. of Thorium=`235-2xx4=227`
Charge no. of Thorium `=92-2xx2-2(-1)=90`
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