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in Periodic Classification of Elements by (44.9k points)
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Explain about the salient features of groups.

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1. Number of electrons in outermost shell: 

The number of electrons present in the outermost shells does not change on moving down in a group, i.e remains the same.

Hence, the valency also remains same within a group.

2. Number of shells: 

In going down a group the number of shells increases by one at each step and ultimately becomes equal to the period number to which the element belongs. 

3. Valency:

The valencies of all the elements of the same group are the same. The valency of an element with respect to oxygen is same in a group. 

4. Metallic character: 

The metallic character of the elements increases in moving from top to bottom in a group.

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