Bond Angle Questions: Is it Applicable for Single Bonded Atoms?

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The bond angle of an atom is relevant only when it is bonded to two or more atoms, as it measures the angle between those bonds. In the case of carbon dioxide (CO2), the bond angle for carbon is 180 degrees due to its linear structure, while oxygen does not have a defined bond angle since it is only bonded to one atom. The discussion emphasizes that bond angles are typically determined for atoms involved in multiple bonds, and therefore, lone pairs do not contribute to a bond angle measurement for an atom bonded to a single other atom. Additionally, the bond angle in carbon monoxide (CO) is not explicitly stated, but it is implied that similar principles apply regarding the definition of bond angles.
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When determining the bond angle of an atom, is it not applicable if you have an atom bonded to only one other atom? such as for CO2, would you only be able to write the angle for C, 180 degrees, but not for oxygen despite the lone pairs?
 
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The bond angle is the angle between two bonds.
 
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I would second that. In my experience, bond angles are always considered between well defined bonds.
 
What is the bond angle in CO molecule?
 
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