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  • Consider the element Mg, Al, S, P amd Si, the correct increasing order of their first ionization enthalpy is: Option: 1 <img alt="Al<Mg<Si<S<P" src="https://entrancecorner.codecogs.com/gif.latex?Al%3CMg%3CSi%3CS%3CP"

Consider the element Mg, Al, S, P amd Si, the correct increasing order of their first ionization enthalpy is:
Option: 1 Al<Mg<Si<S<P
Option: 2 Mg<Al<Si<S<P
Option: 3 Mg<Al<Si<P<S
Option: 4 Al<Mg<S<Si<P

Answers (1)

best_answer

When we move left the first ionization enthalpy increases, then the order should be

Mg < Al < Si < P < S

but due stability of half-filled and fully filled orbitals, the order changes.

Mg has fully filled orbitals and P has half-filled electrons, so both have higher ionization enthalpies compare to their successor element in the periodic table.

Now the correct order of ionisation enthalpy will be

Al < Mg < Si < S < P

Posted by

sudhir.kumar

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