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What information do you get from the fig...

What information do you get from the figure about the atomic number, mass number and valency of atoms X, Y and Z ? Give your answer in a tabular form.

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  3. In the atom of an element X, 6 electrons are present in the outermost ...

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  4. What information do you get from the figure about the atomic number, m...

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  8. The atomic number of calcium and argon are 20 and 18 respectively, but...

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  9. Complete the table on the basis of information available in the symbol...

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  10. Helium atom has 2 electrons in its valence shell but its valency is no...

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  12. An element X has a mass number 4 and atomic number 2. Write the valenc...

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  13. Why do helium, neon and argon have a zero valency?

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  14. The ratio of the radii of hydrogen atom and its nucleus is ~ 10^(5). ...

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  15. Enlist the conclusions drawn by Rutherford from his alpha-ray scatteri...

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  16. In what way is the Rutherford's atomic model different from that of Th...

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  17. What were the drawbacks of Rutherford's model of an atom?

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  18. What are the postulates of Bohr's model of an atom?

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  19. Show diagramatically the electron distributions in a sodium atom and a...

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  20. In the gold foil experiment of Geiger and Marsden, that paved the way ...

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