atomicity

atomicity

A chemist writes the atomicity of a water molecule as "3" on a whiteboard.

Definition
  1. Noun:
    • The state of being composed of atoms: "atomicity" refers to the property or condition of consisting of atoms, especially in the context of chemistry and physics.
    • The number of atoms in a molecule: In chemistry, "atomicity" specifically denotes the total number of atoms present in a single molecule of a substance (e.g., oxygen gas O₂ has an atomicity of 2).
    • Valence or combining power: In older chemical terminology, "atomicity" can also refer to the valence of an element — the number of atoms of hydrogen (or other standard element) that one atom of the element can combine with.
Usage Examples
  • (The molecule has three atoms total.)
  • (The molecule consists of two atoms.)
  • (The valence or combining power.)
Advanced Usage

  • "Atomicity in computer science": In database systems and transaction processing, "atomicity" is a property (part of ACID) ensuring that a series of operations are treated as a single, indivisible unit — either all are completed successfully, or none are applied.

    • The atomicity of the transaction guarantees that if the power fails mid-update, the database remains consistent. (The operations are all-or-nothing.)

  • "Atomicity in chemistry": The concept can be extended to discuss the stability and structure of molecules.

    • The atomicity of ozone (O₃) is three, making it an allotrope of oxygen with distinct chemical properties. (The molecule has three atoms.)
Variants and Related Words
  • Atomic (adj): relating to an atom or atoms.
    • The atomic structure of the element was studied under a microscope. (Relating to atoms.)
  • Atom (n): the smallest unit of a chemical element.
    • A water molecule is made of two hydrogen atoms and one oxygen atom. (The basic particle.)
Synonyms
  • Atom count: the number of atoms in a molecule.
  • Valence: the combining power of an element (older usage).
  • Molecularity: the number of molecules involved in a reaction (distinct from atomicity).
Related Idioms
  • There are no common idioms directly involving "atomicity," but the concept is central to scientific terminology. In computing, the phrase "atomic operation" is used.
    • The database system ensures that each update is an atomic operation. (An indivisible action.)
Phrasal Verbs
  • No phrasal verbs are directly associated with "atomicity," as it is a technical noun.