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The Fundamental Unit of Life
Potassium with 19 electrons has the electronic configuration as K = 2, L = 8, M = 8, N = 1. Why cannot you think of 9 electrons in M-shell when it can contain 18 electrons (2n2 = 18)?
L-shell can contain 18 electrons but Bohr and Bury scheme also says that the outermost orbit in an element cannot contain more than 8 electrons. Therefore, in accordance with this scheme, the nineteenth electron finds a place in the next shell or in N-shell.
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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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