atom
UK: ˈætəm | US: ˈætəm
n. the smallest unit of a chemical element, consisting of a nucleus surrounded by electrons
n. a very small quantity or fragment of something
The word "atom" originates from the Greek "atomos," meaning "uncuttable" or "indivisible." Ancient Greek philosophers (e.g., Democritus) theorized that matter was composed of tiny, indivisible particles. Though modern science has revealed atoms can be split (nuclear fission), the term retains its original logic of being the fundamental, irreducible unit of matter.
An atom consists of protons, neutrons, and electrons.
Scientists can now observe individual atoms using advanced microscopes.
There isn’t an atom of truth in his statement.
The energy released when splitting an atom is immense.
Carbon atoms form the backbone of organic molecules.