Q. 7. Define valency?
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In chemistry, the valence or valency of an element is a measure of its combining capacity with other atoms when it forms chemical compounds or molecules.
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Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.
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The valency of an element is the number of hydrogen atoms that can combine with or replace (either directly or indirectly) one atom of the element. ... For example, oxygen has six valence electrons, but its valency is 2. Some elements may have more than one combining power (or valency), while others have just one.
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