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  4. The radioactive decay of uranium into thorium is given by the equation 92 U238 arrow 90 T h234+X, ?

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Q. The radioactive decay of uranium into thorium is given by the equation ${ }_{92} U^{238} \rightarrow{ }_{90} T h^{234}+X, ?$

Haryana PMTHaryana PMT 2001

Solution:

Total atomic number and mass number should be equal to both sides of equation.
Atomic number of $X =92-90=2$
Mass number of $X =238-234=4$
So, element is $X$, hence it is $\alpha$ particle.( Because atomic number of $\alpha$ is 2 and mass number is 4 )