Periodic ClassificationsPlacing the Elements in the Periodic Table

Placing the Elements in the Periodic Table

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    • Placement of Elements
    • Summary
    • What’s Next?

    In the previous segment of the chapter ‘Periodic Classification of Elements’, we got introduced to the modern periodic table. In this segment, let us study placing the elements in the modern periodic table.

    How are Elements placed in the modern periodic table?

    Modern periodic table

    • The elements are arranged in 18 columns called Groups and 7 rows called the Periods

    in the modern periodic table.

    Groups Periods

    • Each group is a family of elements with similar properties.

    For example, elements like fluorine, chlorine, bromine and iodine have the same number of valence electrons, 7.

    Valence electrons Valency

    • Valency is defined as the capacity of an atom to give or take the electrons during bond formation.
    • Elements belonging to a particular group have the same number of outer electrons.

    Thus, all the elements in one group have the same valency.

    • The number of shells increases as we go down in the group. However, the number of valence electrons remains the same.
    • All the elements have 7 electrons in the outermost orbital despite the different shell numbers.

    Thus, the chemical properties of elements in a group remain the same.

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