What are imp topics in chapter 2nd of chemistry \'\' structures of ato

1.	What are imp topics in chapter 2nd of chemistry \'\' structures of atom\'\'
Answer» Dalton\'s theory,properties of cathode rays,jj Thomsons atomic model,Rutherford experimentn,,bhors atomic model,planks quantum theory,photoelectric effect (VMP) ,de brogle hypothesis,Heisenberg principle,drawbacks of bhors model,....,.,etc.

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