How To Calculate The Effective Nuclear Charge of an Electron

This chemistry video tutorial explains how to calculate the effective nuclear charge of an electron using the atomic number and the number inner shell electrons or core electrons.
Chemistry 1 Final Exam Review: • General Chemistry 1 Re...
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what abt the effect of repulsive force of the electrons present in the same shell??

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[@Joshman3207]

I'm curious, why not use Slater's rules? Does this method just represent an estimate? Whereas slater's is more precise?

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[@shahidamajid3734]

It's optional you can use Slater's rule for screening constant but the method he uses is more conceptual and logical

[@Artist...12356]

​@@shahidamajid3734But brother there is difference in Z effective in both the cases

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[@aishwarya2793]

Is Zeff for n=2 shell in aluminium = 13-2= 11 Am i right? I just want to check if i understand the concept or not

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[@jocelynaleman4403]

so which element in group II of the periodic table will have the highest effective nuclear charge?

[@chibuezeedurumaraihe5343]

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[@adamalif44]

thank you!

[@redzeit]

Wait, what. This is completely different from what I am learning in school. They are teaching that there exist two methods for calculating Zeff, one for the e- present in ns or np subshell and other one for the one present in nd or nf subshell. The first method is as follows :- First write the electronic configuration on the basis of the shell number of the electron, e.g - K = 1s2 2s2-2p6 3s2-3p6 4s1 Now for calculating the effective nuclear charge on any of the e- of 3rd shell (example), multiply the number of e- (of the same shell) except this electron (here 7 = [8 - 1]) by 0.35. {7 * 0.35 = 2.45} Now add this to the product of number of electrons in the predecessor shell (here 8) and 0.85. {2.45 + (8 * 0.85) = 9.25}. Now add this to the product of the rest of electrons beyond the predecessor shell (here 2) and 1. {9.25 + (2 * 1) = 11.25} So, σ = 11.25 Now, Zeff = Z - σ = 19 - 11.25 Zeff = 7.75 I am still learning this method. Please forgive me if I went wrong with anything above. It's just what I am being taught.

[@luckyducky759]

He has another video using that technique, it’s called Z eff using Slater’s rule, which is the one you’re referring to

[@redzeit]

@@luckyducky759 okay alright. But the answers would be different right?

[@luckyducky759]

Samay Jain probably, I think slater ends up with decimal answers, whereas these ones are straight forward, still trying to understand this whole slater concept tho :/

[@redzeit]

@@luckyducky759 yesh same

[@austindasilva1216]

@@redzeit yeah using slaters you would get 3.5

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it's a useful formula of nuclear charge

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[@bobjoe7640]

Why do some effective nuclear charges have a “+” in front of them? Does it matter if there is a plus or not?

[@1wqe7]

Very helpful

[@maryguerrerogutierrez310]

what are the effective nuclear charge for transition metals?

[@MrXxColexX1]

wouldn't this just always be the number of valence electrons? or am I missing something?

[@luckyducky759]

Probably for the outer shell (valance e) but for a different energy level, probably not 🤷🏽‍♀️

[@urmeeghosh9164]

Yes that's correct.

[@brandonpark4126]

Is there an importance to writing a + with the z effective charge because 7 did not have it, but 3 did. Also, z effective cannot be negative right?

[@ishitak134]

Hi! Umm…I have a doubt regarding the electrons. So, Can I know the limit of the electrons that can fit in each shell?

[@adipazir4655]

In each subshell their can be a maximum of 2 electrons however it depends on the shell(how much subshells it has).For instance P shell has 3 subshells Px,Py,Pz each of these can have 2 electrons in them.D has five subshells.F has 7 subshells

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[@alaabadarna2971]

does effective charge have any units? Joule or Coloumb or something?

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How many electrons can the n=3 band hold?

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