homonucleaire
Homonucleaire is a term used in chemistry to describe molecules whose atoms (or nuclei) are identical. It is most often applied to homonuclear diatomic molecules, in which two atoms of the same element form a bond, such as H2, N2, O2, F2, Cl2, Br2, and I2. The contrast is heteronucleaire, where the two atoms are different elements.
Because the atoms are identical, homonuclear diatomics generally lack a permanent dipole moment and are nonpolar.
Quantum-mechanical symmetry and identical nuclei can lead to special phenomena. For H2, nuclear spin statistics produce
Homonucleaire species are common in nature and industry. O2 and N2 dominate Earth's atmosphere; H2 is a
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