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Question

$$A-$$radioactive element whose mass number is $$218$$ and atomic number is $$84$$ emits $$\beta -$ particle. What would be the mass number and atomic number of element after decay?

Solution
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$$_{85}X^{218}\to _{85}Y^{218}+_{-1}\beta^0+v$$
Atomic number of produces nucleus $$=85$$
Mass number $$=218$$

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