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# Which one of the following is correct order of second ionization potential of Na, Ne, Mg and AI?

$\begin {array} {1 1} (1)\;AI < Na < Mg < Ne & \quad (2)\;Ne < AI < Ne < Mg \\ (3)\;Mg < AI < Ne < Na & \quad (4)\;Na < Mg < Ne < AI \end {array}$