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Comment on the statement: “Electrons are common constituents of all matter”.
The statement is true because :
(i) Whatever be the nature of the gas or the material of the cathode, the electrons have the same charge to mass (e/ m) ratio i.e., 1.7589 x 1011 coulomb per kg.
(ii) The electrons obtained by different methods are identical.
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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.
Composition of the nuclei of two atomic species X and Y are given as under
X Y
Protons = 6 6
Neutrons= 6 6
Give the mass numbers of X and Y. What is the relation between the two species?
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