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Explain Rutherford’s α-particle scattering experiment and give its observation and conclusion drawn. 9th Science chapter 4 Structure of the Atoms have many topics. Out of these, the two species which can be termed isobars are: (i) 201 X 60 (ii) 200 X 61 (iii) 200 X 58 (iv) 203 X 60 (a) (i) … By Gurmeet Kaur Jan 13, 2020 15:44 IST. by hportes. 2. ... 9. Download free CBSE Sample paper for Class 9, Chemistry. CBSE Test Papers class 9 Science Structure of the Atoms. Share practice link. The entire NCERT textbook questions have been solved by best teachers for you. Free Online Mock Test for CBSE Class 9 Chemistry for important topics of all chapters in CBSE Class 9 Chemistry book. How many times proton is heavier then electron? None of these. By continuing, I agree that I am at least 13 years old and have read and agree to the. Atoms. 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