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What is Spatial relationship of every atom in a molecule is known as: and explain in detail?
The terms configuration and conformation are often confused:

Configuration refers to the geometric relationship between a given set of atoms, for example, those that distinguish l- from d-amino acids. Interconversion of configurational alternatives requires breaking (and reforming) covalent bonds.
Conformation refers to the spatial relationship of every atom in a molecule.

Ref: Harper’s illustrated biochemistry. 30th edition page no: 36