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monatomic
mon·a·tom·ic [ mònnə tómmik ] or mon·o·a·tom·ic [ mònnō ə tómmik ]


adjective 
Definition:
 
1. with one atom: having only one atom in the molecule
2. with one replaceable atom or group: with one atom or chemical group that can be replaced during a chemical reaction
3. chemistry 
Same as  monovalent (sense 1)


mon·a·tom·ic·al·ly adverb
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