State the reasons for periodicity of elements in periods and groups.

1.	State the reasons for periodicity of elements in periods and groups.
Answer» Reasons for Periodicity in properties in periods and groups. 1. After definite intervals of atomic number, similar valence shell electronic configuration occurs. 2. Properties of elements depend upon the number and arrangement of electrons in various shells including valence shells. 3. In the same period, sub-group, increases or decreases, in a particular property is due to gradual change in electronic configuration in the arranged elements.

Answer»

Reasons for Periodicity in properties in periods and groups.

1. After definite intervals of atomic number, similar valence shell electronic configuration occurs.

2. Properties of elements depend upon the number and arrangement of electrons in various shells including valence shells.

3. In the same period, sub-group, increases or decreases, in a particular property is due to gradual change in electronic configuration in the arranged elements.

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State the reasons for periodicity of elements in periods and groups.

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