The answer depends entirely on what “discovered” means. If it means the first element humans ever touched and shaped into tools, copper and gold both have claims stretching back more than seven thousand years. But if “discovered” means the first element someone identified through deliberate experimentation as a substance not previously known to exist, the credit goes to phosphorus, isolated by the German alchemist Hennig Brand in 1669 from a deeply unappetizing source. The gap between those two answers reveals how our understanding of what an element even is has shifted over the centuries.
Elements Humans Knew Long Before Chemistry Existed
People have been working with certain elements for millennia without having any concept of them as chemical elements. Gold, found in its native metallic state in riverbeds, was collected and shaped in the ancient Near East at least 6,000 years ago. Copper has an even stronger claim to being the earliest element people handled directly. In the Lake Superior basin of North America, indigenous peoples worked deposits of native copper, which is about 99% pure metallic copper, by cold hammering it at or near room temperature and periodically heating it to restore its workability.1Midcontinental Journal of Archaeology. Cold Hammered Archaeology: An Experimental Archaeometallurgical Approach to Native Copper Working in the Lake Superior Basin This technique required no smelting or melting at all, just patient pounding and annealing, and it dates back thousands of years.
In Europe, copper artifacts found across the Northern European Plain have been traced through chemical analysis to ore deposits in southeastern Europe, particularly Serbian mining areas, with use dating to roughly 4100–3300 BC.2PubMed Central. The origin of Neolithic copper on the central Northern European plain and in Southern Scandinavia: Connectivities on a European scale Later Neolithic and Early Bronze Age copper came from the Slovak Ore Mountains and the Alps, and after about 2000 BC, even the Great Orme mine in Wales was a source. Copper, in other words, was circulating across continental trade networks thousands of years before anyone had a word for “element.”
Beyond copper and gold, a handful of other elements were known in the ancient world: sulfur, carbon (as charcoal and soot), iron (initially from meteorites, then smelted), tin, lead, mercury, and silver. These nine or so substances were familiar across multiple civilizations. But no one thought of them as members of a common category. The ancient Greek concept of “elements” referred to earth, water, air, and fire, philosophical abstractions that had nothing to do with the chemical elements we recognize today. So while copper and gold are the oldest elements humans used, calling them the “first discovered” elements stretches the word “discovered” past the breaking point. Nobody realized they had found a fundamental building block of matter. They just found useful metal.
Phosphorus and the Real Beginning of Element Discovery
The story of genuine element discovery begins in 1669, in the laboratory of Hennig Brand, a Hamburg merchant turned alchemist. Brand was searching for the philosopher’s stone, the mythical substance that could supposedly turn base metals into gold. His approach was to experiment with human urine, which he collected in enormous quantities. After letting it putrefy, boiling it down, and heating the residue intensely, he produced a waxy substance that glowed in the dark and burst into flame when exposed to air. He had isolated white phosphorus, a name derived from the Greek for “light bearer.”3PubMed Central. Phosphorus: Chronicles of the epistemology of a vital element
What makes phosphorus the consensus answer to “what was the first discovered element” is not just chronology but methodology. Brand isolated a substance that had never been seen before, documented its remarkable properties, and shared his findings (albeit reluctantly, since he initially tried to keep his glowing substance a secret). This is qualitatively different from picking up a gold nugget or hammering a piece of native copper. It was the first time someone created the conditions for an unknown substance to reveal itself. Within a few decades, other chemists had replicated Brand’s work and began studying phosphorus systematically. The age of element hunting had begun.
Redefining What “Element” Means
For about a century after Brand’s discovery, the list of known elements grew slowly. Chemists isolated a few new metals and studied some gases, but there was still no clear agreement on what counted as an element versus a compound. The ancient idea that all matter was composed of some combination of a few fundamental principles (earth, water, air, fire, and sometimes sulfur, mercury, and salt in alchemical traditions) persisted well into the 1700s.
The conceptual breakthrough is often attributed to Antoine Lavoisier, who in his 1789 “Elements of Chemistry” defined elements as substances that could not be broken down into simpler substances by any known chemical means. This working definition gave chemists a practical tool: if you could not decompose it, it was probably elemental. However, this standard story oversimplifies Lavoisier’s role. The modern concept of a chemical element did not spring fully formed from one book; Lavoisier’s definition was influential, but other factors, including the correction of previously accepted data about atomic weights and the accommodation of already known evidence, played equally significant roles in how the idea spread and took hold.4What Is A Chemical Element?. From Simple Substance to Chemical Element
What Lavoisier’s framework did accomplish was to retroactively make gold, copper, sulfur, and the other anciently known substances into “elements” in the modern sense. It also made it clear that some things previously considered elemental, like water, were actually compounds. This reframing created a new urgency: if elements were defined by their resistance to decomposition, there must be more of them waiting to be found. The race accelerated.
Catching Invisible Elements in Glass Jars
One of the most productive periods of element discovery came in the second half of the 1700s, when chemists figured out how to collect and study gases. Before this era, gases were essentially invisible and impossible to handle. They escaped into the air before anyone could analyze them. New apparatus, particularly the pneumatic trough, changed everything by letting experimenters trap gases over water and examine them individually.
Hydrogen was one of the earliest gas elements to be isolated. Robert Boyle had produced it decades earlier by dissolving iron in acid, but he did not recognize it as a distinct substance with its own set of properties. Henry Cavendish changed that in the 1760s, carefully describing hydrogen’s density and other characteristics and recognizing it as something fundamentally new.5PubMed. Henry Cavendish (1731-1810): hydrogen, carbon dioxide, water, and weighing the world Cavendish called it “inflammable air,” a straightforward name for a gas that burned readily.
Oxygen presented a messier story. Three scientists have credible claims to its discovery: Carl Wilhelm Scheele, a Swedish pharmacist who likely isolated it first around 1772 but delayed publishing; Joseph Priestley, an English clergyman who independently isolated it in 1774 and published quickly; and Lavoisier, who recognized its role in combustion and gave it its name. Rather than declaring a single winner, historians of science have come to see the oxygen discovery as a collective achievement that unfolded over several years, with each contributor offering something the others missed.6Resuscitation. The contributions of Lavoisier, Scheele and Priestley to the early understanding of respiratory physiology in the Eighteenth Century This kind of muddled priority dispute, in which multiple people arrive at the same finding nearly simultaneously, turns out to be a recurring theme in element discovery.
The Electrochemical Explosion
The early 1800s brought a new tool that cracked open a whole category of elements at once: electrolysis. When you run a strong electric current through a molten compound, you can rip apart the chemical bonds holding it together, separating it into its component elements. Humphry Davy, working at the Royal Institution in London, used this method with devastating effectiveness. In a single extraordinary burst of productivity in 1807 and 1808, Davy isolated potassium, sodium, calcium, barium, strontium, and magnesium, all by electrolyzing their molten salts or hydroxides.
These were elements that had stubbornly resisted every previous chemical attack. Potassium and sodium, for instance, are extremely reactive metals that never occur free in nature. They were locked inside minerals and could not be freed by any purely chemical method available at the time. Electricity changed the game entirely. Davy’s discoveries roughly doubled the number of known metallic elements in the span of about two years and demonstrated that the periodic table had far more entries waiting to be filled than anyone had suspected.
When Prediction Became Part of Discovery
By the mid-1800s, enough elements had been found that patterns started emerging. Dmitri Mendeleev’s periodic table, published in 1869, arranged the known elements by atomic weight and chemical behavior, and it left conspicuous gaps where undiscovered elements should fit. Mendeleev famously predicted the properties of several missing elements, including one he called “eka-silicon,” which was later discovered and named germanium in 1886. When germanium’s properties closely matched Mendeleev’s predictions, it appeared to be a stunning vindication of the periodic table.
The standard telling of this story emphasizes Mendeleev’s predictive success as the moment the chemistry community rallied behind his table. The actual historical picture is less dramatic. Careful analysis of how chemists responded at the time shows that there was no sudden shift in attitudes after specific predictions were confirmed. Instead, acceptance of the periodic table was a gradual process in which correcting previously accepted atomic weights and accommodating elements that were already known played roles just as significant as the prediction of new ones. The accommodation of argon, the first noble gas to be identified, was one such case: it did not fit neatly into existing schemes and required the addition of an entirely new column, but ultimately reinforced the table’s organizing power.7Studies in History and Philosophy of Science Part A. Prediction and the periodic table
What the periodic table changed about element discovery is that, for the first time, chemists knew roughly what they were looking for. They knew there were gaps, and they could predict the approximate atomic weight, density, and chemical behavior of the missing elements. Discovery became targeted rather than accidental.
The First Element That Had to Be Made
By the early twentieth century, nearly all the naturally occurring elements had been found. But element 43 remained stubbornly absent. It sat right in the middle of the periodic table, between molybdenum and ruthenium, and chemists had been searching for it for decades with no success. The reason turned out to be simple: element 43 does not occur naturally on Earth in any meaningful quantity. Every isotope of it is radioactive with a half-life too short to have survived since the planet formed.
In 1937, the Italian physicist Emilio Segrè and his coworkers accomplished something no one had done before. Working with molybdenum plates that had been irradiated for several months with a deuterium beam at the Berkeley cyclotron in California, they identified traces of element 43.8A Tale of Seven Elements. Element 43—Technetium They eventually named it technetium, from the Greek word for “artificial,” because it was the first element to be discovered by synthesis in a laboratory.9Nature. What Was the First Discovered Element?
Technetium’s discovery marked a philosophical turning point. Before 1937, every known element had been found in nature and isolated in the lab. After technetium, it became clear that the periodic table might extend into territory where elements simply do not exist in the natural world and have to be manufactured. This opened the path to the transuranic elements, those heavier than uranium, which were created one by one through particle bombardment and nuclear reactions starting in the 1940s.
Filling the Periodic Table to 118 and Beyond
The quest for new elements did not stop with the naturally occurring ones. Over the twentieth and early twenty-first centuries, physicists pushed the periodic table’s boundaries by smashing lighter atoms together at extreme energies and looking for fleeting traces of superheavy elements that exist for fractions of a second before decaying. By 2016, all 118 elements in the first seven rows of the periodic table had been officially named, a milestone that prompted an international review of the criteria used to confirm new element discoveries.10Pure and Applied Chemistry. On the discovery of new elements (IUPAC/IUPAP Report)
Those criteria, maintained jointly by two international scientific unions, are surprisingly strict. A research group claiming discovery of a new element has to demonstrate that it was produced in a way that is clearly attributable to a specific atomic number, and the evidence has to be reproducible, at least in principle. For superheavy elements, this often means detecting a characteristic chain of radioactive decays. The element might exist for less than a millisecond, but its decay signature acts as a fingerprint. Claiming a new element today is less about finding a glowing substance in a flask and more about statistical analysis of decay events recorded by particle detectors.
Research teams are now aiming at elements 119 and 120, which would begin an eighth row of the periodic table. No one knows whether these elements will behave as the table’s patterns predict or whether relativistic effects on electron behavior will scramble the expected chemistry. The discovery game has come a long way from boiling urine in a Hamburg basement.
Why the “First” Question Has No Clean Answer
Asking what was the first discovered element is a bit like asking who invented music. At some point, someone banged on something rhythmic, but calling that the “invention of music” feels wrong. In the same way, the first human to pick up a nugget of gold or hammer a lump of native copper was interacting with an element, but they had no framework that would let them understand it as such. They were not discovering an element; they were finding a useful material.
Phosphorus gets the conventional credit because Brand’s 1669 isolation satisfies the conditions most people intuitively associate with “discovery”: it was unknown before, someone found it through systematic effort, and its unique properties were documented. But even that framing carries biases. Arsenic, antimony, and bismuth were all isolated by medieval alchemists through deliberate chemical processes before Brand was born, yet their histories are hazier and harder to pin to a single moment. The clean narrative of phosphorus as “first” is partly a product of better record-keeping rather than strictly earlier work.
And then there is the question of whether “discovery” requires understanding. Cavendish isolated hydrogen and described its physical properties, but he did not know it was an element in the modern sense. Lavoisier named oxygen and recognized its role in combustion, but he also placed light and heat on his list of elements. Every discoverer worked within the conceptual limits of their time, and those limits shape what we count as a discovery in retrospect.
Technetium’s Odd Afterlife in Medicine
Given its status as the first artificial element and the fact that it barely exists in nature, technetium might seem like a laboratory curiosity. Instead, it became one of the most widely used elements in modern medicine. The isotope technetium-99m, produced in generators at hospitals worldwide, is the workhorse of nuclear medicine imaging. When injected into a patient, it emits gamma rays that a camera can detect, allowing doctors to visualize blood flow through the heart, spot cancerous tumors, and check organ function. Roughly tens of millions of diagnostic procedures each year rely on it.
The reason technetium-99m works so well is an unusual combination of properties: its gamma rays are energetic enough to escape the body and reach a detector but not so energetic that they deliver a large radiation dose, and it has a half-life of about six hours, long enough to perform the scan but short enough that the radioactivity is mostly gone within a day. No naturally occurring element offers this same balance. An element that humans had to invent turned out to be uniquely suited to looking inside the human body.