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The Fundamental Unit of Life
What observation led to the conclusion that the nature of the anode rays depend upon the gas used in the cathode rays tube?
It was found that e/ m value for positive rays are different when the enclosed gas in the cathode rays tube is different. This is possible when different gases give different types of positive rays which contain particles having different masses and different charges. Thus, the mass and charge of positive ray particles depends upon the gas which is taken in the discharge tube. The positive particles obtained from hydrogen gas are the lightest and have the highest charge to mass ratio.
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What are the limitations of J.J. Thomson’s model of atom?
What are the limitations of Rutherford model of the atom?
Describe Bohr's model of the atom ?
Compare all the proposed models of an atom given in this chapter.
Summarize the rules for writing of distribution of electrons in various shells for the first eighteen elements.
Define valency by taking examples of silicon and oxygen.
Explain with examples, (i) Atomic number, (ii) Mass number, (iii) Isotopes, and (iv) Isobars. Give any two uses of isotopes also.
Na+ has completely filled K and L-shells. Explain.
If Z = 3, what would be the valency of the element? Also, name the element.
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