Significance of Electronic Configuration


 
 
Concept Explanation
 

Significance of Electronic Configuration

Significance of electronic configuration: It plays an important role in determining the chemical behavior of an element.

  • When the atom of an element has a completely filled outermost shell, the element will be chemically unreactive. For example: The noble gases (He,Ne,Ar,Kr,Xe,Rn) have completely filled outermost shell i.e. the outermost shells of the noble gases contain 8 electrons. Except helium which contains 2 electrons.
  • When the atom of an element has less than 8 electrons in its outermost shell, the element will be reactive. The exception to this is helium.
  • Sample Questions
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    Question : 1

    Which of the following statement / statements are correct :

    (a) When the atom of an element has a completely filled outermost shell i.e., 4 electrons, the element will be chemically unreactive like Argon.

    (b) When the atom of an element has a completely filled outermost shell i.e., 8 electrons, the element will be chemically unreactive like Krypton.

    Right Option : B
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    Question : 2

    If the element have 3 electron in its outermost shell then it is ___________ in nature.

    Right Option : C
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    Question : 3

    Which of the following statement / statements are correct :

    (a) When the atom of an element has a completely filled outermost shell i.e., 2 electrons, the element will be chemically unreactive like Argon.

    (b) If the element have 8 electrons in its outermost shell than it is unreactive  in nature.

    (c) The valency of Oxygen is 2 because it contains 2 electrons in its outermost shell.

    (d) The valency of Aluminium  is 3 because it contains 3 electrons in its outermost shell.

    Right Option : B
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