1.

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.

Answer»

Solution :`""_(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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