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I'm in class 12

i have my physics pre board exam tomorrow
i have never done/learnt the chapter "atoms and nuclie",plz tell me what derivations or questions should i learn?
i have never even touched the chapter.


OHH don't worry first you have to learn some main topics like ATOMS, in rutherford's model of atom, Rutherford nuclear model, Spectrum and you shold solve some important numericals which you feel that this numerical is important and able to come on exam.

Now you should learn some important topics:-
1. Lyman series
2 Pfund series
3 Paschen series 
4. balmer series 
5 Brackett series

learn these topics carefully and best of luck for your exams.
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