The total number of isoelectronic species from the given set is $.......$
$O^{2-}, F^{-}, Al, Mg^{2+}, Na^{+}, O^{+}, Mg, Al^{3+}, F$

  • A
    $5$
  • B
    $4$
  • C
    $3$
  • D
    $2$

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$(iii)$ $Mg^{2+}$
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