100. The correct order of decreasing first ionisation en
ergy is :-
(1) SI > Al> Mg > Na
(3) Al> Si > Mg > Na
(2) Si > Mg > Al> Na
(4) Mg > LI > Al> Si
101. Out of N.
Mo.2
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1=Na>Mg>Al>Sl
2=Na>Mg>Al>Si
3=Na>Mg>Al>Si
4=Ll>Mg>Al>Si
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