La longueur de la liaison H-Br est 0,151 nm et celle de la liaison H-H est 0,074 nm. Peut-on e

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La longueur de la liaison H-Br est 0,151 nm et celle de la...

La longueur de la liaison $\mathrm{H}-\mathrm{Br}$ est $0,151 \mathrm{~nm}$ et celle de la liaison $\mathrm{H}-\mathrm{H}$ est $0,074 \mathrm{~nm}$. Peut-on en déduire la longueur de la liaison $\mathrm{Br}-\mathrm{Br}$ dans le dibrome?

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Key Concepts

Limitations of Extrapolating Bond Lengths

Inferring the bond length of one molecule by directly comparing or combining measured bond lengths from different molecules (for example, heteronuclear versus homonuclear bonds) is generally not valid. Each bond length is influenced by the specific electronic structure and atomic interactions of the molecules involved, meaning that simple arithmetic manipulation of known bond lengths does not reliably predict an unknown bond length in a different molecular context.

Covalent Bond Length

This concept refers to the distance between the nuclei of two atoms that are bonded together in a molecule. It is determined by the balance between attractive forces (mainly due to the shared electrons in the bond) and repulsive forces (between the positively charged nuclei) as well as the spatial distribution of the electron cloud.

Atomic Radii and Electronegativity

The size of an atom, often expressed as its covalent radius, plays a significant role in the bond length. Different atoms, such as hydrogen and bromine, have very different radii, and these differences affect how close they can approach each other in a chemical bond. Electronegativity differences may also influence the electron distribution and thus the bond length.

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