Xenon
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40 free Xenon trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Xenon is one of the rarest gases in the air you breathe, and for decades after its discovery chemists were sure it could do nothing at all. They were wrong. The element that was supposed to sit quietly in a corner of the periodic table has since turned up in spacecraft, operating theatres, cinemas, car headlights and some of the most sensitive physics experiments ever built. These fun facts about xenon are written as quiz questions. They cover who found the gas and what its name means, which family of elements it belongs to, how it finally lost its reputation for never reacting, and the odd jobs it does today. A few questions follow xenon into nuclear reactors, onto the sports doping list and back to the birth of the Solar System. The quiz suits curious readers, chemistry students and anyone putting together a science round for a trivia night. Every answer comes with a short explanation, and the difficulty runs from easy openers to a handful of questions for real enthusiasts.
30 of 40 questions with answers and explanations. Play the quiz
Q 01In 1989, scientists arranged 35 individual xenon atoms on a metal surface to spell the name of which company?
IBM
IBM researcher Don Eigler nudged the atoms into place one at a time on a chilled nickel crystal. It was the first time anyone had precisely positioned single atoms on a flat surface.
Q 02Helium turns a voice squeaky, but what does breathing in dense xenon gas do to a person's voice?
Makes it deeper
Xenon makes it deeper because sound crawls through the heavy gas at just 169 metres per second. Many universities have banned the stunt, since xenon is costly and can starve the body of oxygen.
Q 03Xenon was the development codename of which Microsoft games console, released in 2005?
Xbox 360
Xbox 360 planning began in 2003 under the Xenon name. The label stuck to the hardware as well: the three-core processor inside the console is also called Xenon.
Q 04In 2025, four British climbers inhaled xenon before scaling which mountain on a trip lasting about a week?
Mount Everest
Mount Everest normally demands several weeks of acclimatisation, which the team said the gas let them skip. Mountaineering's world federation replied that no evidence shows xenon helps at altitude.
Q 05A build-up of neutron-absorbing xenon-135 in the reactor core contributed to which nuclear power plant disaster?
Chernobyl
Chernobyl's reactor was throttled back for a safety test, and xenon-135 dragged its power to near-shutdown levels. Operators withdrew nearly all the control rods to recover, leaving the core unstable.
Q 06NASA's Dawn spacecraft, which orbited both Vesta and Ceres, used xenon as the propellant in which kind of engine?
Ion thruster
Ion thruster engines give xenon atoms an electric charge and fling them out up to ten times faster than chemical rocket exhaust. Dawn's push was gentle, but it used only about 3 milligrams of xenon a second.
Q 07Xenon, a rare gas discovered in 1898, takes its name from a Greek word with which meaning?
Stranger
Stranger is the meaning of the Greek word xenos. The discoverers first wanted to name the gas after the colour of its glow, but chemists had already used up every suitable Greek and Latin root.
Q 08Research into why deep-sea divers felt drunk led a US Navy doctor to deduce that xenon could work as what?
An anesthetic
An anesthetic is what xenon proved to be: in 1951 it put two surgical patients under for the first time. It remains a rarity in operating theatres because the gas costs far more than standard drugs.
Q 09Tanks holding tonnes of liquid xenon deep beneath Italy's Gran Sasso mountain are built to detect what?
Dark matter
Dark matter particles should, in theory, occasionally strike a xenon nucleus and set off a faint flash of light. Liquid xenon is dense enough to offer plenty of targets and to shield its own core from stray radiation.
Q 10Xenon sits in group 18 of the periodic table, a family of elements known by which name?
Noble gases
Noble gases take the name from the German Edelgas, coined in 1900 to mark how little they react. Xenon broke the rule in 1962, becoming the first of the family to be forced into a chemical compound.
Q 11Inside a gas-discharge tube, xenon gives off a glow of which colour when electricity passes through it?
Blue
Blue wins out because xenon's most intense emission lines fall in that part of the spectrum. Its fainter lines span every visible colour, which is why high-pressure xenon lamps shine white.
Q 12Which cinema format's dome projectors have used single xenon lamps rated as high as 15 kilowatts?
IMAX
IMAX bulbs hold xenon at about 25 atmospheres, so projectionists wear protective body armour when handling one in case it shatters. Each lamp lasts roughly 1,000 hours and needs its own water cooler.
Q 13The first working laser, built in 1960, used a coiled xenon flash lamp to energise a crystal of which gemstone?
Ruby
Q 21The first xenon compound, made in 1962, was a salt containing fluorine and which precious metal?
Platinum
Platinum hexafluoride, a deep-red vapour, met colourless xenon and at once left a yellow solid. Later work showed the product was probably a mixture of several xenon salts, not one pure compound.
Q 22Chemists have made a complex in which four xenon atoms bond to a single atom of which famously unreactive metal?
Gold
Gold sits at the centre of the complex in a rare +2 state, ringed by four xenon atoms. Two elements known for refusing to react end up bonded directly to each other.
Q 23Xenon lamps took over cinema projection from the 1950s, replacing which older, more labour-intensive light source?
Carbon arcs
Ruby was a material rival laser builders had written off, but Theodore Maiman trusted his own analysis. A General Electric salesman supplied the xenon lamps, boasting the largest could set steel wool alight.
Q 14Each tiny cell of which flat-screen television technology, popular in the 2000s, held a mixture of xenon and neon?
Plasma display
Plasma display cells ionise the gas so that it gives off ultraviolet light, which in turn makes a phosphor coating glow. Each pixel works like a microscopic fluorescent lamp.
Q 15Traces of radioactive xenon detected in the air over Canada in 2006 confirmed a nuclear test by which country?
North Korea
North Korea had set off its first device underground, but xenon gas seeps out through rock. Two weeks later a monitoring station picked it up, and analysts tracked the air back to its source.
Q 16Which Scottish chemist discovered xenon with Morris Travers and went on to win the 1904 Nobel Prize in Chemistry?
William Ramsay
William Ramsay was honoured for uncovering a whole new column of the periodic table. Besides xenon, he had a hand in isolating argon, helium, neon and krypton.
Q 17Xenon was first found in 1898 in the residue left behind after slowly evaporating what?
Liquefied air
Liquefied air handed the same two chemists three new elements within weeks in 1898: krypton first, then neon, and finally xenon.
Q 18In which British city was xenon discovered in 1898, at the college where its finder held the chair of chemistry?
London
London's University College was the scene. Chemists there isolated five of the naturally occurring gases in xenon's group of the periodic table.
Q 19Which chemist made the first xenon compound in 1962, overturning the belief that such gases never react?
Neil Bartlett
Neil Bartlett had noticed that xenon gives up an electron about as easily as oxygen does, so he tried on it a reaction that already worked for oxygen. A mustard-yellow solid formed.
Q 20Which American chemist, famous for his work on chemical bonds, predicted in 1933 that xenon could form compounds?
Linus Pauling
Linus Pauling made the call almost thirty years before anyone succeeded, then changed his mind: in 1961 he declared xenon completely unreactive. The first compound appeared the very next year.
Carbon arcs were shorter-lived and took more work to run. Germany's Osram put the xenon replacement on sale in 1952, two years after its first public film screening in Berlin.
Q 24Which instrument did researchers use in 1989 to drag individual xenon atoms into position across a nickel crystal?
Scanning tunneling microscope
Scanning tunneling microscope tips had previously been used only to take atomic-resolution images. This was the first time one served as a tool for moving atoms about.
Q 25Which planet's atmosphere holds a puzzlingly high share of xenon, about 2.6 times the proportion found in the Sun?
Jupiter
Jupiter's surplus is still unexplained. One idea is that icy building blocks trapped the gas early on, before the young Sun had warmed the disc of material around it.
Q 26Xenon trapped in rock at Oklo shows how natural nuclear reactors ran two billion years ago in which country?
Gabon
Gabon's ancient reactors switched themselves on and off. The xenon record shows about 30 minutes of fission followed by two and a half hours of cooling, over and over.
Q 27Xenon was banned in sport in 2014 over claims that inhaling it boosts the body's output of which hormone?
Erythropoietin
Erythropoietin, better known as EPO, tells the body to make more red blood cells. The ban came before any reliable test for the gas existed, and studies suggest xenon does not improve performance anyway.
Q 28Which MIT engineer, nicknamed Papa Flash, invented the xenon flash lamp and froze a bullet passing through an apple?
Harold Edgerton
Harold Edgerton could fire flashes as brief as a millionth of a second by 1934. He picked up the nickname while building underwater camera gear for Jacques Cousteau.
Q 29Doctors can image a patient's lungs by having them inhale hyperpolarized xenon-129 inside which kind of machine?
MRI scanner
MRI scanner images pick up the xenon after its nuclei have been lined up in advance using polarised light. Unlike radioactive xenon-133, this form exposes the patient to no ionising radiation.
Q 30Xenon-135 unexpectedly shut down the first large-scale nuclear reactor in 1944 at which Manhattan Project site?
Hanford
Hanford's B Reactor shut itself down, then restarted unaided about 15 hours later. Physicist John Wheeler suspected a short-lived fission product that soaks up neutrons, and he was right.