# Ionization Energies Of Noble Gases

by chikis
Tags: energies, gases, ionization, noble
 P: 235 1. The problem statement, all variables and given/known data I was going through my past question and answer, I then came across this: "The noble gases have the highest ionization energies in each period". I then wondered why and how the above statement is a reality. How can the above statement be true when the noble gases have large atomic radi? 2. Relevant equations No equation is involved. 3. The attempt at a solution I know that Ionization energy, is the energy required to remove the outermost electron from a gasous atom. If you say that the noble gases has the highest Ionization energies, how true is that when you know that the noble gases have a relatively large atomic radius? I belive that the noble gases should have the lowest ionization energy since they have large atomic radius. This (lowest ionization energy) is possible because the larger the atomic radius the farer the distance of the outermost electron from the attraction of the nucleuos, thereby making it easier for outermost electron to escape. In such circustance, the outermost electron will leave with a very small energy. From my statement above, I have it that the noble gases have the lowest and not the highest ionization energy. If you the person viewing this my thread has a contrary view to mine on this concept on discusion feel free to share your own opinion. Let's see how we can collectively solve this problem.
 P: 157 You are forgetting that the noble gases are (generally) inert. They all have a full outer shell of electrons, which makes it very difficult to remove any electrons.
P: 235
 Quote by tal444 You are forgetting that the noble gases are (generally) inert. They all have a full outer shell of electrons, which makes it very difficult to remove any electrons.
So is that the reason why they should have high ionization energies?

 Sci Advisor HW Helper PF Gold P: 3,724 Ionization Energies Of Noble Gases And the fact that that they have the highest Zeff within each period.
P: 235
 Quote by chemisttree And the fact that that they have the highest Zeff within each period.
What is the meaning of this "Zeff"?
 P: 235 Did any of you agree with me that noble gases have largd atomic radi?
P: 23,536
 Quote by chikis What is the meaning of this "Zeff"?
http://en.wikipedia.org/wiki/Effective_nuclear_charge
Mentor
P: 12,069
 Quote by chikis Did any of you agree with me that noble gases have largd atomic radi?
P: 235
 Quote by Borek http://en.wikipedia.org/wiki/Effective_nuclear_charge
For now, I understand from the link you pasted in that "Zeff" stands for effective nuclear charge. But with time, I will post in what I found complicating with the link. Thank you.
P: 235
I have open the link which you pasted in. The link contained information concerning trends in periodic table, like ionization enegy, atomic radi, electron affinity, electronegative and the rest.
The issue is that my question has not been answered. My question is this, did any of you agree with me that noble gases have large atomic radius in each period?
Watch the link below and see for your self why am asking that question. In that link, you will see that in each period you go, the noble gases have large atomic radi which is equal in size to those of akali metals. So you now see why am asking that question with much zeal and expecting an answer.

 P: 157 From http://en.wikipedia.org/wiki/Periodi...#Atomic_radius: "The atomic radius tends to decrease as one progresses across a period from left to right". This quote clearly states that atomic radii DECREASES from left to right. As noble gases are on the very right, this would mean that noble gases actually have the SMALLEST radii in their respective periods.
P: 23,536
Data for Rn shows that the table can't be trusted.
P: 235
 Quote by Borek Data for Rn shows that the table can't be trusted.
What do you mean by Rn?
 P: 157 Rn stands for Radon.
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P: 12,069
 Quote by chikis What do you mean by Rn?
Don't be afraid of trying google for basic information like that:

or

(A lot faster than waiting 10 hours for somebody to post an answer to your question.)
P: 235
 Quote by tal444 Rn stands for Radon.
Thank you for reminding me.
HW Helper
PF Gold
P: 3,724
 Quote by chikis So you now see why am asking that question with much zeal and expecting an answer.
Much zeal?
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P: 12,069