Overview

A list of elements by symbol arranges chemical elements according to their official one- or two-letter abbreviations rather than by full name or atomic number. Chemical symbols are compact identifiers used worldwide in science, education, industry and databases. Such lists are helpful for quick lookups, keyboard entry, indexing, and reference when space is limited.

Notation and conventions

Chemical symbols follow conventions set by international bodies: the first letter is capitalized and any second letter is lower-case (for example, Fe, not FE or fe). Most modern official symbols are one or two letters; historically, temporary three-letter systematic symbols were used for newly synthesized elements before formal names were approved. Many symbols derive from Latin or other historical names (for example, Na for sodium, from natrium).

Ordering and differences from other lists

When elements are listed by symbol they are typically ordered alphabetically using the symbol string: A, Ac, Ag, Al, Am, … This differs from the periodic table's standard arrangement by atomic number, which reflects electronic structure and chemical trends. A symbol-ordered list is useful for alphabetical lookup and for tasks where the symbol itself is the primary key (file names, catalogs, form fields).

Uses and examples

Lists by symbol appear in glossaries, quick-reference charts, software menus, and educational materials. They are also the basis for parsing chemical formulas and writing reactions. Representative entries (symbol — name — atomic number):

  • H — Hydrogen — 1
  • He — Helium — 2
  • Fe — Iron — 26
  • Au — Gold — 79
  • U — Uranium — 92

Notable points

Because symbols are language-independent and concise, they reduce ambiguity across translations. However, a symbol list does not convey periodic relationships or properties; for that, ordering by atomic number or grouping by chemical families is more informative. Historical and temporary symbols occasionally appear in older literature, so users should check the context when reading legacy sources.