# Question 4553b

##### 1 Answer
May 26, 2016

""_92^238U atom when disintegrates emitting 3 $\alpha$ particles it is trasfomed into ""_86^226Rn atom which after disintegrating 2 $\beta$ particles turns to ""_88^226Ra

#### Explanation:

Each $\alpha$ particle has 4 unit mass and 2 unit positive charge.So after emission of 3 $\alpha$ particles the "_92^238U# turns into new element having mass no.$238 - 3 \cdot 4 = 226$ and atomic no.$92 - 3 \cdot 2 = 86$.The new atom formed is Radon(Rn).

Each $\beta$ particle has negligible mass but one unit negative charge.Rn atom gains two unit nuclear charge and gets transformed into Ra of mass no.226 and atomic no.88.when 2 $\beta$ particles are emitted from its nucleus.