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The Fundamental Unit of Life
How do you define valency of an atom?
The number of electrons determining the combining capacity of an atom is known as its valency.
For example, oxygen has six valence electrons but to combine with other atoms it must accept two electrons. So its valency is -2. The valency of lithium is one as these lose one electron, when combine with other atoms.
i) If the atom contains 1, 2 or 3 electrons in its outermost shell, then valency is equal to the valence electrons.
ii) If the number of electrons in the outermost shell of an atom is more than four then the valency is equal 8 minus number of valence electron present in outer most 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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