H

Homonuclear

Quick Reference
Also Known AsHomonuclear molecule, nonpolar molecule, same-atom molecule, diatomic element

What is Homonuclear?

Homonuclear refers to molecules or species composed of only one type of atom. Homonuclear diatomic molecules consist of two identical atoms bonded together (e.g., H₂, O₂, N₂, F₂, Cl₂). These molecules are always non-polar because the bond electrons are shared equally. Homonuclear molecules have symmetric molecular orbital diagrams.

Properties & Characteristics

Homonuclear diatomics: H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂ (and At₂). Bond polarity: zero (nonpolar). No permanent dipole moment. Molecular orbital diagram: symmetric (gerade and ungerade designations). IR inactive (homonuclear diatomics have no IR absorption — no change in dipole).

Uses & Applications

Industrial gases: N₂ (inert atmosphere), O₂ (combustion, medical), H₂ (fuel, hydrogenation), Cl₂ (disinfection, synthesis). Understanding chemical bonding. Spectroscopy (Raman active but IR inactive for diatomics). Atmospheric chemistry (O₂, N₂ are 99% of atmosphere).

Safety Information

Homonuclear diatomics: H₂ and F₂ are highly reactive/flammable/explosive. Cl₂ is toxic (IDLH: 10 ppm). O₂ supports combustion. N₂ asphyxiant in enclosed spaces. Each requires specific safe handling procedures.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Homonuclear
Synonyms Homonuclear molecule, nonpolar molecule, same-atom molecule, diatomic element

Frequently Asked Questions

Homonuclear refers to molecules or species composed of only one type of atom. Homonuclear diatomic molecules consist of two identical atoms bonded together (e.g., H₂, O₂, N₂, F₂, Cl₂). These molecules are always non-polar because the bond electrons are shared equally. Homonuclear molecules have symmetric molecular orbital diagrams.

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