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The value of four quantum number for the...

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 vlaue 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 possible value of all four quantum numbers for 90th electron of atom of element 'X' is:

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