Atoms \( { }_{7} \mathrm{X}^{\mathrm{A}},{ }_{8} \mathrm{Y}^{\mathrm{B}} \) and \( { }_{9} \math...

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Atoms \( { }_{7} \mathrm{X}^{\mathrm{A}},{ }_{8} \mathrm{Y}^{\mathrm{B}} \) and \( { }_{9} \mathrm{Z}^{17} \) are such that \( { }_{8} \mathrm{Y} \) is an isobar of \( { }_{7} \mathrm{X} \) and atom \( { }_{9} \mathrm{Z}^{17} \) is isotone of \( { }_{8} \mathrm{Y} \). Mass no. of \( \mathrm{X} \) and no. of neutrons in \( \mathrm{Y} \) are respectively:
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