The valency of an element or a group denotes it's combining capacity. The valencies of other elements/groups is the number of hydrogen atoms which can combine with or be displaced by one atom of that element/group.
Note :This is the old definition of valency as even I didn't read about the modern definition, it will be in higher classes.
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An element is the measure of its combining capacity with other atoms when it forms chemical compounds or molecules is called valency.
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The valency of an element or a group denotes it's combining capacity. The valencies of other elements/groups is the number of hydrogen atoms which can combine with or be displaced by one atom of that element/group.
Note : This is the old definition of valency as even I didn't read about the modern definition, it will be in higher classes.