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If A is a radioactive element which emit...

If A is a radioactive element which emits an `alpha`-particle and produces `""_104Rf^(259)`. Write the atomic number and mass number of the element A.

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`""_(Z)X^(A) overset(alpha "decay")to ""_(Z-2)Y^(A-4)+ ""_(2)He^(4)(alpha "decay")`
`""_(106)X^(263) overset(alpha "decay")to ""_(104)Rf^(259)+ ""_(2)He^(4)(alpha "decay")`
In a elements having number is 106 and mass number is 263
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