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Can anyone explain me why the energy of 2s orbital of Lithium is more than that of sodium ?

Energies depend upon the distance of the orbital from the nucleus and also the number of electrons present in it.
As the atomic number increases the atomic radius increases leading to increases in the distance from the nucleus and thus decrease in energy.
Also the inter-electronic repulsion between electrons of the same orbital becomes prominent. Thus due to the combinations of the above factors the overall energy decreases.
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alright ! Thank you la-one-yeah :) But can you explain one more thing, how going away from nucleus decrease the energy? doesn't energy increase with increase in orbit number? o.o
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Hope this explanation is crct...Abhi- sue- man-shake :)

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Well..Abhi which books do you refer for physical chemistry and physics( lyk electrostatics) apart from your study packages?? I didn't find hc verma much useful. It's good...that's it....pls ans soon before the experts end this chat...If they have closed this chat then ans in any of the question that I've asked...got it!!
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Oh yes ! I got it finally . Thank you ! :D

As far as book is concerned , In my 11th , I solved DC Pandey ( only level 2 ques ) + Universal self scorer ( except critical questions and assertion reason ) for physics

In my 12th, I had less time, so I did questions solely from Universal self scorer ( except few chapters like modern physics and semiconductors )

DC pandey level 2 has conceptual questions. It has less questions per chapter , so can be solved within time but Universal self scorer has around 300-1200 questions per chapter ( like in electrostats , it has around 1200 ques ) , so it's too time consuming but once you solve all the questions, you become thorough with the formulae. 

I told you this about the questions practice part. Regarding the theory in physics, I was totally dependent upon my coaching notes ;) 

Which aakash centre are you in ?

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My aakash center is in thillai nagar, above pantloons.
Then , are you refering something for physical chemistry or just ur fitjee packges?? B'coz here in my package there are many unsolved questions in 'solutions ' chapter and I feel it quite difficult..
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