Question

The first ionization potential of Na, Mg, Al, Si are in the order of : ( give justification)
1) Na < Mg > Al < Si
2) Na > Mg > Al > Si
3)Na < Mg < Al > Si
4) Na > Mg > Al < Si. Justify

Answer 1

hey!!

here is ur answer!!

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As we all know

 on moving from left to right across the period in the modern periodic table the ionisation potential increases with the decrease in Atomic size and increase in nuclear charge..

on moving from top to bottom down a group the ionisation potential decreases with the increase in Atomic size and increase in nuclear charge in a modern periodic table..

ACCORDING TO YOUR QUESTION...

the order will be 

Na > Mg > Al > Si...

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Hope this helps u!!