What does monatomic mean?
The term monatomic describes a chemical element that exists as a single atom, rather than bonded to other atoms as a molecule. Monatomic elements, such as the noble gases (e.g., helium, neon, argon), are typically unreactive and stable under standard conditions. In chemistry and physics, the term monatomic is used to distinguish these elements from polyatomic molecules, which consist of multiple atoms bonded together. Understanding whether an element is monatomic or polyatomic is crucial for predicting its chemical behavior and properties. Monatomic gases, for instance, have distinct thermodynamic properties compared to polyatomic gases.
adjectiveMonatomic refers to a chemical element that exists as a single atom, rather than as a molecule composed of multiple atoms.
- Referring to a single atom
- Having a single atom in a molecule
"Helium is a monatomic gas under standard conditions."
"The noble gases are monatomic under standard conditions."
"Argon is a monatomic gas used in light bulbs."
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of monatomic
The term monatomic originates from the Greek words 'monos,' meaning alone or single, and 'atomos,' meaning indivisible. The concept of atoms as indivisible particles dates back to ancient Greek philosophers, but the modern understanding of monatomic elements developed with the discovery of noble gases in the late 19th century.
Usage notes
Often used in chemistry and physics to describe elements or gases.