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Justify the inclusion of alkali metals i...

Justify the inclusion of alkali metals in the same group of the periodic table with reference to the following.
(i) Electronic configuration.

Text Solution

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The electronic configurations of alkali metals are as follow.

All these elements have same outer electronic configuration. The modern periodic table is developed basing on electronic configuration. Since all these elements having same outer electronic configuration their inclusion in the same group is justified.
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Knowledge Check

  • Elements of the same vertical group of the periodic table have

    A
    same atomic size
    B
    same electronic configuration
    C
    same number of electrons in outermost shell of their atoms
    D
    same number of atoms

  • Which of the following pair of elements are from the same group of the periodic table

    A
    Mg,Cs
    B
    Mg,Sr
    C
    Mg,Cl
    D
    Na,Cl

  • In the first group (alkali metals) :

    A
    Lithium fluoride is most soluble fluoride (in water)
    B
    Lithium iodide has maximum covalent character out of all halides
    C
    Lithium carbonate is least thermally stable carbonate
    D
    Lithium oxide is most basic oxide

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