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Which of the following statement is true |
${ }_{78} P t^{192}$ has 78 neutrons ${ }_{84} \mathrm{Po}^{214} \rightarrow { }_{82} \mathrm{Pb}^{210}+\beta^{-}$ ${ }_{92} U^{238} \rightarrow {}_{90} \mathrm{Th}^{234}+{ }_2 \mathrm{He}^4$ ${ }_{90} \mathrm{Th}^{234} \rightarrow {}_{91} \mathrm{Pa}^{234}+{ }_2 \mathrm{He}^4$ |
${ }_{84} \mathrm{Po}^{214} \rightarrow { }_{82} \mathrm{Pb}^{210}+\beta^{-}$ |
in option b , atomic number and mass number is not conserved. |
