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AMO ren ie, , PART A : Give Short Answers :, , 0.1. What are canal rays ?, 0.2. Name the three subatomic particles of an atom., 0.3. Why atom is considered as a neutral particle ?, , Q.4. Write the distribution of electrons in sodium and, chlorine atoms., , Q.5. If K, L and M shell of an atom are full, then what, would be the total number of electrons in the, , atom ?, Q.6. How will you find the valency of sodium, chlorine, and argon ? 1x 6=6, , PART B : Give Reasons for the Following :, , @.7. Why Ernest Rutherford selected a gold foil for his, experiments ?, , Q@8. Why Ernest Rutherford got unexpected results from, his experiment ?, , @9. Why those atoms show little chemical activity who, have their outermost shell completely filled?, , @10. Why Thomson's model of an atom was rejected ?, , @11. What was the drawback of Rutherford’s model of an, atom ? 1x«5#5, , PART C ; Differentiate Between the Following :, , 012, Compare the properties of electrons, protons and, neutrons,, , 0.13, Compare the models of an atom proposed by, Thomson, Rutherford and Neils Boh, 3x2=6, , DPA re =.