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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 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:

A

118 and 136

B

218 and 236

C

236 and 254

D

226 and 244

Text Solution

Verified by Experts

The correct Answer is:
C
`Z=118, B-2Z=18,` so B=254
and `B-A=18` so A=236
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