13. Why is the slope for the first ionization energies of the Noble Gases (magen

Question

13. Why is the slope for the first ionization energies of the Noble Gases (magenta curve) shaped the way it is? Period 2 Period3 Period 4 Ne 2000 eneray d ecreases in 1500 CI raup when we move Chelium to Krypton) because the outer shel 25 3035 20 Atomic number 10 15 ons becomesarrher removed e rom the nueus Extra credit: Where would Xenon fall in terms of ionization energy? Estimate a value in kJ-mol'. xenon would fal pelow xypton olc as we move down the groop the onizathon energy decreases. An eshmated value 14. The Group I elements have a different, yet distinctive curve, in comparison to the Noble Gases (the green curve). Posit a reason for this particular trend.

Explanation / Answer

Ans 13 :

Ionization energy is the enrgy required to remove the electron from the outermost shell of an element.

Since the general electron configuration of noble elements is ns2 sp6 , they have completely filled octets , and hence stable , so removing electron from their shells requires a lot of energy.

Now going from top to bottom in a group ,the atomic size of the element increases and the last electron of the element becomes farther from the nucleus , due to which the ionization energy decreases.

Since Xe lies below Kr in the modern periodic table , its value of ionization energy will also be less than that of Kr , it will be approximately 1100 KJ/mol

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