JEE MAIN - Chemistry (2021 - 24th February Morning Shift - No. 4)
Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization
enthalpy is :
Al < Mg < Si < S < P
Al < Mg < S < Si < P
Mg < Al < Si < S < P
Mg < Al < Si < P < S
Explanation
On moving left to right in a period of the periodic table, Ionisation energy (I.E.) increases due to increase in effective nuclear charge i.e. Zeff.
But due to extra stability of fully filled and half-filled electronic configuration of Mg and P required ionisation enthalpy is more from neighbouring elements.
i.e. First ionisation enthalpy order is Al < Mg < Si < S < P.
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