1.

The radioactive nucleide ""_(90)^(134)Th undergoes two successive beta- deacys followed by one alpha- decay. The atomic number and mass number respectively of the resulting radionucleide is :

Answer»

94 and 230
90 and 230
92 and 230
92 and 234

Solution :`""_(92)^(234)Thoverset(2-overset(0)1E)to""_(92)^(234)Xoverset(-_(2)^(4)He)to""_(90)^(230)Y`


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