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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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`""_106A^(263) to ""_104Rf^(259) +""_2He^(4)`
Atomic number : 106, Mass number: 263.
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