What If I Told You the Periodic Table Changed in Your Lifetime?
If you took chemistry in high school before 2016, your periodic table was already out of date. The last elements added to the periodic table were officially recognized by the International Union of Pure and Applied Chemistry (IUPAC) in late 2015, and formally named in November 2016. Not by a little — by four entire elements. They are elements 113, 115, 117, and 118 — Nihonium*, Moscovium*, Tennessine*, and Oganesson*.
Here's the thing — most people never heard about it. That's why there was no parade. No breaking news interrupting your favorite show. Just a quiet announcement in a chemistry journal, and suddenly every science classroom poster in the world was technically wrong.
What Is the Last Element on the Periodic Table?
When people ask "what's the last element," they usually mean one of two things: the most recently discovered one, or the one at the very bottom of the table with the highest atomic number. Turns out, the answer to both is essentially the same story.
The last element added — both chronologically and in terms of position — is Oganesson, atomic number 118. It sits at the very end of the seventh period, in the noble gases column, right below Radon. And no, you won't find it anywhere in nature. It doesn't exist outside a laboratory, and even there, it barely exists at all.
The Four Newcomers
In December 2015, IUPAC announced that four new elements had been verified enough to earn permanent spots on the periodic table. Here's the breakdown:
- Element 113 — Nihonium (Nh): Discovered by a team at the RIKEN institute in Japan. It was the first element ever discovered in an Asian country, and the name comes from Nihon*, the Japanese word for Japan.
- Element 115 — Moscovium (Mc): Credited to a joint team from the Joint Institute for Nuclear Research (JINR) in Russia and Lawrence Livermore National Laboratory in the U.S. Named after the Moscow region.
- Element 117 — Tennessine (Ts): Also a Russia-U.S. collaboration, named after the state of Tennessee, home to Oak Ridge National Laboratory which contributed key materials.
- Element 118 — Oganesson (Og): The heaviest element known. Named after Yuri Oganessian, a Russian nuclear physicist who was still alive at the time — an extremely rare honor in chemistry.
All four were officially named in November 2016, which is the date most people cite as "when the periodic table was last updated."
Why It Matters / Why People Care
Why does adding a few atoms of something that lasts for milliseconds matter? Think about it: fair question. The short version is that these elements push the boundaries of what matter can do.
Every time scientists create a heavier element, they're testing the limits of atomic structure. The nucleus of Oganesson contains 118 protons. That said, think about that — 118 positively charged particles crammed into a space smaller than a speck of dust, all repelling each other. The fact that it holds together even for a fraction of a second tells us something profound about the strong nuclear force and the physics of extreme matter.
And then there's the practical angle. The search for superheavy elements led to the development of new accelerator technologies, new detection methods, and new theoretical models. It's not about making useful materials — it's about understanding the universe at its most fundamental level.
There's also the human story. Nihonium was a triumph for Japanese science — the result of nearly a decade of relentless work by a small team led by Kosuke Morita. They started their experiments in 2003 and didn't get IUPAC recognition until 2015. That's twelve years of grinding for a handful of atoms.
How It Works (or How to Do It)
So how do you actually make a new element? You can't just mix chemicals in a beaker. You need a particle accelerator, a target material, and a lot of patience.
The Basic Process
Here's what happens, roughly:
- Choose your target. Scientists take a heavy, relatively stable element — like Californium or Americium — and make it into a thin film or foil.
- Choose your projectile. They then accelerate a beam of lighter ions — like Calcium-48 — to about 10% of the speed of light.
- Smash them together. The beam hits the target. Most of the time, nothing happens. But very occasionally — maybe once in a trillion collisions — the nuclei fuse.
- Detect the decay. The new superheavy element is unstable. It decays almost immediately, releasing alpha particles. Scientists detect this decay chain, and if it matches what theory predicts, they know they've made something new.
The RIKEN Method for Nihonium
The Japanese team at RIKEN took a slightly different approach. They bombarded a Bismuth target with Zinc ions. The problem? Plus, the fusion probability was incredibly low. They ran their experiment for years, accumulating beam time that would make most researchers quit. Their first results in 2004 were tentative. They repeated the experiment. And they got one atom. Then another. Then a third — and that's what finally convinced IUPAC.
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The Russia-U.S. Collaboration
The Dubna-Livermore team had access to more powerful equipment and used heavier targets. For Oganesson, they bombarded a Californium-249 target with Calcium-48 ions. On the flip side, they detected the decay chain that matched the predicted path for element 118, and also observed element 116 as a decay product. This was in 2006, and it took nearly a decade of verification and replication before IUPAC gave the green light.
Common Mistakes / What Most People Get Wrong
There are a few misconceptions floating around about the last elements added to the periodic table, and honestly, some of them are understandable.
"They discovered new elements in nature."
Nope. They were synthesized in labs. If they ever existed in nature — say, in supernovae or neutron star collisions — they decayed long, long ago. The half-lives of these elements are measured in milliseconds or less. None of these elements exist naturally on Earth. You'd never stumble across them in a mine or a meteorite.
"The periodic table is complete now."
Not exactly. But physicists have been theorizing about an "island of stability" for decades. The seventh period is complete — that's true. Some models predict elements that could last for minutes, days, or even longer. The idea is that certain superheavy elements, maybe around atomic number 120 or 126, might have longer half-lives than their neighbors. We haven't found them yet, but the search continues.
"These elements have practical uses."
Real talk — they don't. In practice, you can't build anything out of Oganesson because you can only make a few atoms at a time, and they vanish almost instantly. Not in any conventional sense. The value is in the science itself — testing nuclear models, understanding the limits of matter, and pushing technology forward.
"The last element was added in 2015."
This is half-right. IUPAC announced
the official names for elements 113, 115, 117, and 118 in 2016, following years of intense debate over nomenclature. While the discovery of these atoms happened in the early to mid-2000s, it took the scientific community several years to move from "tentative observation" to "official recognition." This delay wasn't due to error, but rather a rigorous verification process designed to check that no two labs were claiming the same discovery by mistake.
The Future of the Periodic Table
As we look toward the next decade, the focus is shifting from simply "finding" elements to "understanding" them. We are moving past the era of mere discovery and into the era of precision measurement.
Current research is focused on three main fronts. Still, first, there is the hunt for the elusive Island of Stability. If we can reach the "magic numbers" of protons and neutrons predicted by theorists, we might find elements that don't just vanish in a blink, but instead persist long enough to be studied in detail. Second, there is the development of more advanced heavy-ion accelerators, capable of producing even higher-intensity beams to increase the chances of successful fusion. Finally, there is the theoretical challenge: as we move further down the table, the relativistic effects—where electrons move so fast they gain significant mass—begin to change the chemical properties of the elements, making them behave in ways that defy traditional periodic trends.
Conclusion
The discovery of the superheavy elements represents the absolute frontier of human knowledge. But each new atom added to the periodic table is a triumph of engineering and a testament to human persistence. Plus, we are essentially poking at the very fabric of reality, testing the limits of how much matter can be squeezed into a single nucleus before it falls apart. While elements like Nihonium and Oganesson may never see the light of day in a consumer product, they serve a much higher purpose: they are the milestones on our map of the universe, proving that even the most extreme states of matter can be understood, measured, and mastered.
