1.

In the radioactive decay: ""_(Y)X^(Z)overset(-(8alpha and 6beta))to""_(82)Pb^(206)X, y and z are

Answer»

U, 92 and 235
Th, 90 and 232
Pu, 94 and 238
U, 92 and 238.

Solution :`y-8(2)+6(1)=82,y=92`
`z-8(4)=206 ,:.z=238`
So, X is `""_(92)U^(238)`


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