The value of four quantum number for the last electron of atom of element ' \( \mathrm{X} \) ' a....

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The value of four quantum number for the last electron of atom of element ' \( \mathrm{X} \) ' are \( \mathrm{n}=7, l=1, \mathrm{~m}=+1 \) and \( \mathrm{s}=+1 / 2 \) or
\( \mathrm{P} \)
\( -1 / 2 \) and value of spin magnetic momentum for element ' \( \mathrm{X} \) ' is zero. Element ' \( \mathrm{X} \) ' has two isotopes (I) \( { }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X} \), (II) \( { }_{\mathrm{Z}}^{\mathrm{B}} \mathrm{X} \). (Given: " \( \mathrm{B}-\mathrm{A}=\mathrm{B}-2 \mathrm{Z}=18 \) ", where \( \mathrm{A} \) and \( \mathrm{B} \) are atomic masses and \( \mathrm{Z} \) is atomic number)

The value of \( A \) and \( B \) respectively are:
(1) 118 and 136
(2) 218 and 236
(3) 236 and 254
(4) 226 and 244


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