Missing Letters! These Two Letters Are Nowhere on the Periodic Table!

The names of the elements on the periodic table boast a rich tapestry of origins, reflecting centuries of scientific discovery and cultural influence. Many elements draw their appellations from ancient languages like Latin and Greek, describing properties, geographical locations of discovery, or even figures from mythology. Other elements honor notable scientists or the places where they were synthesized. This diverse nomenclature, established over time and standardized by the International Union of Pure and Applied Chemistry (IUPAC), explains why certain letters of the alphabet are more represented than others.

One of the two missing letters, 'J', has a particularly interesting linguistic history. In classical Latin, the letter 'J' did not exist as a distinct character; instead, the letter 'I' served both as a vowel and a consonant (pronounced like the 'y' in 'yet'). It was only much later, in the late Middle Ages and early modern period, that 'J' evolved as a separate letter to distinguish the consonantal sound from the vocalic 'I'. Since many foundational element names were established from older Latin or Greek roots, or when 'J' was not yet a fully distinct letter in scientific convention, it naturally found no place. Even iodine, known as "Jod" in German for a time, ultimately received the international symbol 'I'.

The absence of 'Q' stems from similar reasons related to linguistic prevalence and naming conventions. 'Q' is generally less common in the Latin and Greek vocabulary that heavily influenced early scientific terminology. While elements are typically given one or two-letter symbols derived from their names, no proposed or officially recognized element name has necessitated the use of 'Q' as its primary identifying letter or as part of its chemical symbol. The established rules for naming new elements prioritize clarity, historical continuity, and avoiding duplication, and to date, no discovery has led to a name that would incorporate this less frequently occurring letter.