1.

The value of four quantum number for the last electron of atom of element 'X' are n=7, l=1,m=+1 and s=+1/2 or -1/2 and value of spin magnetic momentum for element 'X' is zero element 'X' has two isotopes (I) ""_(Z)^(A)X and(II) ""_(Z)^(B)X. Q. The value of A and B respectively are:

Answer»

118 and 136
218 and 236
236 and 254
226 and 244

Solution :`Z=118, B-2Z=18,` so B=254
and `B-A=18` so A=236


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