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Explain about the general characteristics of periods.

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1. Number of electrons in outermost shell: 

The number of electrons present in the outermost shell increases from 1 to 8 as we proceed in a period. 

2. Number of shells: 

As we move from left to right in a period the shells remains the same. The number of shells present in the elements corresponds to the period number. 

For example : all the elements of 2 period have on 2 shells (K, L)

3. Valency: 

The valency of the elements increases from left to right in a period. With respect to hydrogen. the valency of period elements increases from 1 to 4 and then falls to one. With respect to oxygen, the valency increases from1 to 7.

4. Metallic character: 

The metallic character of the elements decreases across a period.

 For example:

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