monatomic
Definition
- Adjective:
- Consisting of single atoms: Describes a chemical element or substance whose particles are individual, unbonded atoms rather than molecules composed of multiple atoms bonded together.
- Relating to single atoms: Pertaining to the properties, behavior, or state of isolated atoms.
Usage Examples
- Adjective:
- Noble gases like helium and neon are typically monatomic under standard conditions.
- In this high-temperature plasma, the gas becomes monatomic.
- The monatomic nature of argon makes it chemically inert.
Advanced Usage
- Scientific Context: The term is primarily used in chemistry and physics to describe the physical state or molecularity of a substance.
- Monatomic ions, such as Na⁺ or Cl⁻, are single atoms that carry an electric charge.
- Contrast with Diatomic/Polyatomic: Used to distinguish from elements that naturally exist as molecules (e.g., O₂ is diatomic; O₃, ozone, is triatomic).
- Unlike monatomic argon, oxygen in the air is diatomic.
Variants and Related Words
- Monoatomic: An alternative, less common spelling with the same meaning.
- Atomic (adj): Relating to atoms. (Note: "Atomic" is a broader term; "monatomic" specifies a state of being single, unbonded atoms.)
Synonyms
- One-atom (descriptive phrase, not a standard synonym).
- Uncombined atomic (descriptive phrase).
Antonyms
- Diatomic: Consisting of two atoms.
- Polyatomic: Consisting of multiple (more than two) atoms.
- Molecular: Consisting of molecules.
Adjective
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of or relating to an element consisting of a single atom
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helium and argon are monatomic gases
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