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The 1st ionization potential Na,Mg,Al and Si are :

$ (a)\;Na < Mg > Al < Si \\(b)\; Na > Mg > Al > Si\\ (c)\;Na < Mg < Al > Si \\ (d)\;Na > Mg > Al < Si $

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The correct order is $ Na < Mg > Al < Si$
Hence a is the correct answer.
answered Mar 11, 2014 by meena.p
 

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