Explain about the salient features of groups.

1.	Explain about the salient features of groups.
Answer» 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.

Answer»

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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