There are actually far more than five elements on the periodic table whose symbols seem to have nothing to do with their English names. Depending on how strictly you count, the number lands around eleven. The reason is straightforward: when the Swedish chemist Jöns Jacob Berzelius standardized chemical symbols in the early 1800s, he based them on Latin (and occasionally Greek or German) names for the elements, while the English-speaking world had already settled on different common names rooted in Anglo-Saxon, Arabic, or other traditions. The result is a periodic table where sodium is Na, lead is Pb, and mercury is Hg, leaving generations of chemistry students wondering where those letters came from.
Why Latin Stuck Around in the Symbols
Before Berzelius proposed his letter-based system, chemistry was a mess of competing notations. Alchemists used pictographic symbols for elements and compounds, with circles, crescents, and arrows standing in for gold, silver, and iron. Swedish chemist Torbern Bergman tried to systematize alchemical symbols into formulas, and French chemists Hassenfratz and Adet devised an elaborate sign language of their own, but it was too complicated to catch on. John Dalton’s atomic theory introduced little globules to represent atoms, which was a step forward conceptually but still clumsy on paper.1ChemPlusChem. The Transition from Alchemical to Modern Chemical Symbolism: from Bergman and Guiton de Morveau to Hassenfratz and Adet, Higgins, Richter, Dalton, and Berzelius Berzelius cut through all of this by assigning each element one or two letters from its Latin name. The system was clean, compact, and worked across language barriers because Latin was still the shared language of European science.
That Latin foundation is exactly why the mismatches exist. English names for many elements came from Germanic, Arabic, or everyday trade words. But Berzelius and the chemists who followed him had no reason to change a symbol just because one particular language called the element something different. A German chemist, a French chemist, and an English chemist all needed the same shorthand, and Latin served that purpose.
Sodium and Potassium
These two are probably the most commonly cited examples. Sodium’s symbol is Na, taken from the Latin “natrium,” which itself traces back to “natron,” the name for the mineral form of sodium carbonate that Egyptians used in mummification and glassmaking. The English name “sodium” comes from a different path entirely, derived from “soda,” the term for the powdery sodium compounds that had been traded around the Mediterranean for centuries.2Oriental Journal of Chemistry. A Linguistic Study of Chemical Terms So English speakers say “sodium” from the soda connection, while the symbol preserves the natron connection. Both refer to the same family of compounds, just through different linguistic doors.
Potassium follows a similar pattern. Its symbol, K, comes from “kalium,” the Medieval Latin word for potash. The English name “potassium” comes from that same “potash,” the substance obtained by evaporating water that had been filtered through wood ashes in iron pots. Berzelius chose the Latin-rooted K, while English kept the more plainly descriptive name.2Oriental Journal of Chemistry. A Linguistic Study of Chemical Terms In many European languages, the element is actually called something like “kalium,” so the symbol K makes perfect sense to a German or Dutch speaker. The mismatch is really an English-language problem.
Iron, Gold, and Silver
Iron’s symbol, Fe, comes from the Latin “ferrum.” The English word “iron” has Old English and Proto-Germanic roots that are entirely unrelated to anything Latin. This one is a clean split: the common name went one direction through the Germanic language family, and the scientific symbol went another through Latin.2Oriental Journal of Chemistry. A Linguistic Study of Chemical Terms
Gold (Au) gets its symbol from “aurum,” Latin for gold, which may derive from a word meaning “shining dawn.” The English name “gold” comes from the Proto-Germanic word for the metal’s yellow color. Silver’s symbol, Ag, comes from “argentum,” the Latin word that also gave Argentina its name (early Spanish explorers heard rumors of silver deposits in the region).2Oriental Journal of Chemistry. A Linguistic Study of Chemical Terms The English word “silver” again comes from Germanic roots. In all three cases, the Latin-derived symbol and the Germanic-derived name have coexisted for two centuries without anyone feeling the need to reconcile them.
Lead and Mercury
Lead’s symbol, Pb, comes from “plumbum,” the Latin word that also gave us “plumbing” and “plumb line,” because the Romans used lead extensively for water pipes and construction weights. The element has been known and used for thousands of years, and lead poisoning was already recognized in antiquity, though that knowledge was largely lost in the literature until the end of the Middle Ages before being “rediscovered” as industrialization created epidemic-scale exposure.3American Journal of Industrial Medicine. Lead poisoning in a historical perspective The English word “lead” has Old English origins unrelated to the Latin.
Mercury has perhaps the most dramatic mismatch of all. Its symbol, Hg, comes from “hydrargyrum,” a Latinized form of the Greek “hydrargyros,” meaning “water-silver” or “liquid silver.” That name perfectly describes the metal’s most striking property: it is a shiny, silvery liquid at room temperature. The English name “mercury” comes from the Roman god Mercury, the fleet-footed messenger, presumably because of the metal’s quick, rolling movement. The element’s older English name was “quicksilver,” which is essentially a translation of the Greek original.
Mercury’s unusual physical properties made it fascinating to early chemists and dangerous to later ones. Metallic mercury can be vaporized at room temperature, reaching concentrations roughly a hundred times the safe limit in a closed space, and it crosses easily into the brain, where it causes tremor, depression, and behavioral changes. A separate danger comes when bacteria at the bottom of lakes convert metallic mercury into organic mercury compounds, which are fat-soluble and accumulate up the food chain.4Journal of Human Hypertension. Toxicity of mercury That process was behind the tragedy at Minamata Bay in Japan in the 1950s. All of this history is wrapped up in a two-letter symbol that most people would never guess stands for “liquid silver.”
Tin and Antimony
Tin’s symbol, Sn, comes from “stannum,” the Latin word for the metal. Like iron and gold, tin has an English name rooted in the Germanic language family that diverged from the Latin centuries ago. Tin is one of the oldest metals known to humanity, essential to the Bronze Age when it was alloyed with copper, and the Latin name was simply what Berzelius reached for when assigning symbols.
Antimony’s symbol, Sb, comes from “stibium,” the Latin name derived from the Greek “stibi,” which referred to the mineral stibnite (antimony sulfide). Ancient Egyptians used powdered stibnite as kohl, the dark eye cosmetic. The English name “antimony” has a murkier origin. One popular folk etymology traces it to “anti-monos” (against solitude, because the element is rarely found alone in nature), but the real derivation is debated. What is not debated is that Sb and “antimony” share no obvious letters, making this one of the more puzzling mismatches on the periodic table for anyone encountering it for the first time.
Tungsten and Wolfram
Tungsten is the odd one in this group because its symbol, W, does not come from Latin. It comes from “wolfram,” the German and Swedish name for the element. The name “wolfram” itself has a colorful backstory: tin smelters in medieval Germany noticed that a particular ore contaminated their tin and reduced the yield, as though it “devoured” the tin like a wolf. The ore was called “wolf rahm” (wolf’s froth or wolf’s cream). Swedish chemists Carl Wilhelm Scheele and later the Spanish Elhuyar brothers isolated the element in the 1780s, and the name “tungsten” (from the Swedish “tung sten,” meaning “heavy stone”) became standard in English and French.
But German, Swedish, and several other European language traditions kept “wolfram,” and since Berzelius was Swedish and the German chemical tradition was enormous, the symbol W won out. This makes tungsten the only element whose symbol comes from a Germanic rather than a classical language. IUPAC officially recognizes “tungsten” as the element’s name but keeps W as the symbol, a compromise that satisfies nobody entirely and everyone just enough.
Copper, the Near Miss
Copper is sometimes left off lists of mismatched elements because the symbol Cu looks like it could be an abbreviation of “copper.” It is not, at least not directly. Cu comes from “cuprum,” the Latin word for the metal, which in turn derives from “Cyprium aes” (metal from Cyprus), because Cyprus was a major copper-mining center in the ancient world.2Oriental Journal of Chemistry. A Linguistic Study of Chemical Terms The English word “copper” descends from the same root through Old English “copor,” so the symbol and the name are distant cousins rather than strangers. Still, Cu is not an intuitive abbreviation of “copper” for anyone who does not know the Latin, so it often shows up in these discussions.
Languages Where the Symbols Make Perfect Sense
One thing that often gets lost in English-language discussions of this topic is that these symbols are not mismatches for everyone. German speakers call potassium “Kalium” and sodium “Natrium.” For them, K and Na are perfectly logical abbreviations. French speakers call gold “or” (from “aurum”) and silver “argent” (from “argentum”), making Au and Ag unsurprising. Spanish speakers call iron “hierro,” which descends from “ferrum,” so Fe feels natural. The mismatch is mostly an English-language phenomenon, with some overlap in other Germanic languages that adopted different common names for these metals.
This is not a coincidence. English borrowed heavily from both Germanic and Latin sources over the centuries, but for everyday metals that people had been handling since prehistory, the Germanic names stuck in daily life. Nobody called a horseshoe “ferrum” in a London blacksmith’s shop. Meanwhile, the scientific naming convention drew from Latin precisely because it was a language that no living nation “owned” and that educated people across Europe shared. The result is that English ended up with two naming systems running in parallel for the same elements: one for the street and one for the laboratory.
Why New Elements Do Not Have This Problem
Every element discovered since the mid-twentieth century has a symbol that matches its name, and that is by design. IUPAC, the international body that governs chemical nomenclature, has a formal procedure for naming new elements. After a discovery is confirmed by a joint working group, the discoverers propose both a name and a symbol. Elements can be named after a mythological concept, a mineral, a place, a property, or a scientist.5IUPAC. How to Name New Chemical Elements The symbol is then derived directly from the approved name, so you get Og for oganesson, Ts for tennessine, and Mc for moscovium. There is no opportunity for a Latin name to sneak in and diverge from the English one because the process creates both simultaneously.
The older mismatched symbols are essentially grandfathered in. Nobody at IUPAC has any appetite for changing Na to So or Pb to Ld. The symbols are embedded in millions of textbooks, databases, journal articles, and chemical formulas. More practically, changing them would create confusion across languages. Renaming Na to So would fix the mismatch for English speakers but create a brand-new mismatch for German speakers who call the element Natrium. The Latin-rooted symbols are, in a sense, the most diplomatically neutral option available, even if they confuse beginning chemistry students in English-speaking countries.
Memorizing the Mismatches
For students, these eleven or so elements are a perennial stumbling block. You can learn the rest of the periodic table’s symbols by just reading the first one or two letters of the English name, but these require rote memorization of a separate vocabulary. Research on chemistry education has found that mnemonic and visual approaches can meaningfully help. In one study, students who learned periodic table content through mnemonics and visual aids improved their average test scores from about 82% to 93%, a statistically significant gain with a moderate effect size.6Jurnal Abdimas Madani Dan Lestari (JAMALI). Mnemonic and Visual Approaches to Improve Students’ Understanding of the Periodic System of Elements at SMAN 2 Banjarbaru Students also reported finding the mnemonic method more engaging than traditional memorization.
Common mnemonics for these elements lean on the etymology. Remembering that “plumbing” comes from “plumbum” locks in Pb for lead. Associating “ferrous” (as in ferrous metals, a term most people have heard) with iron makes Fe stick. For mercury, knowing that the old word “quicksilver” is just English for “hydrargyrum” connects the Hg. Some teachers use the phrase “SiLver is from ArGentum” to link Ag, since the capitalized letters in the phrase mirror the symbol. These tricks work because they turn an arbitrary-seeming symbol into a small story, and stories are easier to recall than raw letter pairs.
Elements That Almost Made the Mismatch List
A few elements have symbols that look slightly off but are actually straightforward abbreviations. Manganese (Mn) sometimes confuses students who expect Ma, but Mn simply uses the first and third letters to avoid clashing with magnesium (Mg). Similarly, zinc is Zn, not Zi, because the convention prefers a consonant after the first letter. These are not true mismatches; the symbols still come from the element’s internationally recognized name. They are just abbreviation quirks.
Then there are elements whose English names are borrowed so directly from Latin that the symbol and name align even though the name is technically Latin in origin. Calcium (Ca), from “calx” (lime), and carbon (C), from “carbo” (coal), are examples. English absorbed the Latin name wholesale rather than developing a separate Germanic word for these elements, so no mismatch ever arose. The elements that ended up with mismatched symbols are specifically those where English developed or inherited a common name from a non-Latin source before the scientific naming convention was standardized.
How Other Scientific Fields Handle the Same Problem
Chemistry is not alone in having naming systems that diverge from everyday language. Astronomy uses Latin names for constellations and planetary features. Anatomy labels body parts in Latin (the humerus rather than “the upper arm bone”). Biology classifies species with binomial Latin names. In each case, the reason is the same one that drove Berzelius: Latin provides a shared, stable vocabulary that does not shift as living languages evolve. If English speakers had renamed sodium’s symbol every time the preferred English term changed, the periodic table would need constant revision.
The trade-off is accessibility. A system built for international consistency inevitably creates friction for any single language community. English speakers pay that cost most visibly for about eleven elements, a manageable number but a persistent source of confusion for every new generation of students learning their way around the periodic table. The symbols endure because the alternative, language-specific symbol sets, would be far worse for a global scientific enterprise that depends on everyone reading the same formulas the same way.