Question

What is divalent and monovalent atom

Answer 1

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Illustrated Glossary of Organic Chemistry -Monovalent. Monovalent: An atom having just one covalent bond. In this molecule the hydrogen atom and chlorine atoms are monovalent, the oxygen atom is divalent, the nitrogen atom is trivalent, and the carbonatom is tetravalent.
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Answer 2

The atoms having valency of one are said to be monovalent

The atoms having valency of two are said to be divalent