Noble Gases
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50 free Noble Gases trivia questions with answers — science & nature quiz, new questions added Oct 2026.
The noble gases are the quiet corner of the periodic table: helium, neon, argon, krypton, xenon and radon, plus a lab-made newcomer called oganesson. They have no colour and no smell, and they almost never react with anything, which is exactly what makes them so useful. They fill party balloons and glowing shop signs, and they turn up in places you would not expect, from operating theatres to spacecraft. This quiz collects the best fun facts about the whole family: how each one was discovered and named, what they do in everyday technology, why one of them is a health hazard at home, and the odd things they get up to when chilled close to absolute zero. Every question comes with a short explanation, so each answer leaves you with a fact worth repeating. It suits chemistry students revising the periodic table, teachers looking for a classroom warm-up and anyone who enjoys science trivia. The early questions are ones most people can reason out, and the tougher ones are saved for later rounds.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Helium was first spotted in the light of which celestial body, decades before anyone found it on Earth?
The Sun
The Sun gave helium away as an unknown yellow line in its spectrum, recorded during an 1868 eclipse. The element is named after helios, the Greek word for the Sun, and was not isolated on Earth until 1895.
Q 02Why does a person's voice turn squeaky after inhaling helium from a party balloon?
Sound travels faster in it
Sound travels faster in it, nearly three times as fast as in air, so the vocal tract resonates at higher frequencies. The vocal cords themselves vibrate exactly as they did before.
Q 03The noble gas krypton shares its name with the doomed home planet of which comic-book superhero?
Superman
Superman was sent to Earth from Krypton, a world his creators Jerry Siegel and Joe Shuster named after the chemical element. Real krypton is a colourless gas, nothing like green kryptonite.
Q 04Signs of every colour get called neon signs, but pure neon gas itself glows which colour?
Reddish-orange
Reddish-orange is the only colour a tube of pure neon glows when electricity passes through it. Other shades come from different gases or from glowing coatings on the inside of the glass tube.
Q 05Radon seeping into homes is rated the top cause of which disease among Americans who have never smoked?
Lung cancer
Lung cancer linked to radon kills about 21,000 Americans a year by official estimates, and only cigarettes cause more cases. The gas has no colour or smell, so only a test reveals it.
Q 06Radon seeps out of the ground and into houses, where it tends to build up in which part?
The basement
The basement sits closest to the soil, and radon is denser than air, so the gas pools there. Better ventilation or a sump under the floor usually brings the level down.
Q 07The airship Hindenburg, destroyed by fire in 1937, was lifted not by helium but by which flammable gas?
Hydrogen
Hydrogen filled the Hindenburg because the United States, which then had a monopoly on helium, had banned its export. Airships today fly on helium, which cannot burn.
Q 08Most of the helium in the universe was forged within a few minutes of which event?
The Big Bang
The Big Bang produced the vast majority of the universe's helium in its first few minutes, before the expanding cosmos cooled too far for fusion. Stars have been adding a little more ever since.
Q 09Xenon is the starter gas in the high-intensity lamps fitted to which part of many cars?
Headlights
Headlights of the high-intensity discharge type use xenon as their starter gas. The same element fires camera flashes, and xenon lamps took over from carbon arcs in cinema projectors.
Q 10Liquid helium's main commercial job is chilling the superconducting magnets in which hospital machines?
MRI scanners
MRI scanners rely on magnets that lose all electrical resistance only when bathed in liquid helium, a few degrees above absolute zero. Cooling of this kind is the largest use of the gas.
Q 11The noble gases fill which numbered column, on the far right-hand edge of the periodic table?
Group 18
Group 18 has been the official label since 1988. Older tables called the same column group 0, because its elements were thought to have no ability to combine with anything else.
Q 12Every noble gas except helium has how many electrons in its outermost shell, a famously stable arrangement?
Eight
Eight outer electrons make a full shell, leaving the atoms with almost no reason to react. Helium is the exception with just two electrons in total, yet its one shell is full as well.
Q 13Argon's name comes from a Greek word with which meaning, a dig at its refusal to react with anything?
Lazy
Lazy, or inactive, is what the Greek argos means. The gas earned the label when it was first isolated in 1894 at University College London, by stripping everything else out of a sample of clean air.
Q 21Oganesson honours Yuri Oganessian; which other element was named after a scientist who was still alive?
Seaborgium
Seaborgium was named for Glenn Seaborg in his lifetime, an honour no one else shared until oganesson was named in 2016. Einstein and Fermi both died before their elements' names became official.
Q 22Calculations suggest oganesson, the heaviest of the noble gas family, would be what at room temperature?
A solid
A solid is what theory predicts, because the pull of 118 protons warps the way its electrons behave. Only a few atoms have ever been made, each surviving about a thousandth of a second.
Q 23Xenon is the favoured propellant for which kind of spacecraft engine, used by NASA's Dawn probe to reach Ceres?
Ion thruster
Q 14Krypton, which makes up roughly one millionth of the atmosphere, has a Greek name with which meaning?
Hidden
Hidden is the sense of the Greek kryptos. The gas stayed undiscovered until 1898, when it turned up in the residue left after nearly all of a sample of liquid air had been boiled away.
Q 15Xenon's name shares a Greek root with the word xenophobia; what does that root mean?
Stranger
Stranger, foreigner or guest are all senses of the Greek xenos. The name suited a gas so scarce that it makes up only about one part in 11.5 million of the atmosphere.
Q 16Which relative of neon's co-discoverer suggested naming the gas after the Latin word for new?
His son
His son proposed novum, Latin for new. The chemist liked the idea but swapped in the Greek equivalent, which gave the world the word neon in 1898.
Q 17Which Scottish chemist won the 1904 Nobel Prize in Chemistry for discovering the noble gases in air?
William Ramsay
William Ramsay isolated argon, helium, neon, krypton and xenon within a few years. His finds added a whole new section to the periodic table.
Q 18Which physicist's discovery that nitrogen from air outweighed lab-made nitrogen led straight to argon?
Lord Rayleigh
Lord Rayleigh traced the density gap to an unknown gas mixed into the nitrogen taken from air. He received the 1904 Nobel Prize in Physics for the work.
Q 19In 1962 Neil Bartlett made the first noble gas compound by bonding xenon to platinum and which other element?
Fluorine
Fluorine and platinum made up the fierce oxidising agent that Bartlett let loose on xenon. The yellow product that formed overturned the textbook rule that noble gases never react.
Q 20Radon forms naturally in rocks and soil as part of the slow decay chain of which heavy metal?
Uranium
Uranium in rocks such as granite decays step by step through radium into radon, which is why the gas rises from the ground all over the world. Radon atoms themselves last only days.
Ion thruster engines give xenon atoms an electric charge and fire them out at enormous speed. Xenon suits the job because it ionises easily and can be stored compactly as a liquid.
Q 24Despite barely reacting with anything, xenon has been used in operating theatres since 1951 as what?
A general anaesthetic
A general anaesthetic is one of xenon's odder talents, first given to two patients by the American doctor Stuart Cullen. Its scarcity makes it far costlier than the usual drugs.
Q 25From 1960 to 1983, a wavelength of light given off by krypton atoms defined which unit of measurement?
The metre
The metre was fixed at 1,650,763.73 wavelengths of krypton-86 light, replacing a metal bar kept in France. Since 1983 the unit has been tied to the speed of light instead.
Q 26In which trade is argon blown over hot molten metal to shield it from the oxygen in air?
Welding
Welding is the main industrial job for argon, which will not react even with white-hot metal. Left unshielded, the molten pool soaks up gases from the air and the finished joint turns porous and brittle.
Q 27Argon is often sealed inside which household fixture because it lets less heat escape than ordinary air?
Double-glazed windows
Double-glazed windows are often filled with argon, which conducts only about 67% as much heat as air. Krypton insulates better still, but it is far scarcer and costs much more.
Q 28Argon makes up nearly 1% of dry air, which puts it where among the atmosphere's most abundant gases?
Third
Third place goes to argon, behind only nitrogen and oxygen. Air holds more than twenty times as much argon as carbon dioxide, and over 500 times as much argon as neon.
Q 29Nearly all the argon in Earth's atmosphere was made by the slow radioactive decay of which element in rocks?
Potassium
Potassium in the crust includes a radioactive form that slowly turns into argon. Geologists use that steady conversion as a clock, measuring the trapped argon to work out the age of a rock.
Q 30Chilled to about two degrees above absolute zero, liquid helium becomes which friction-free state of matter?
Superfluid
Superfluid helium flows with no measurable viscosity, slipping through channels far too narrow for an ordinary liquid. Pyotr Kapitsa in Moscow and two physicists in Cambridge independently reported the effect in 1938.