Fluorine
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50 free Fluorine trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Fluorine is the element that reacts with almost everything. It took chemists most of a century, and cost several of them their health, before anyone managed to isolate it. Today its compounds are in non-stick pans, raincoats, medicines and the water supply. This quiz turns the best fluorine fun facts into multiple-choice questions: how the element was discovered and named, why it is so fierce, where it is found in nature, and the famous products and accidents it is behind. Every answer comes with a short explanation. It suits chemistry students revising the periodic table, teachers after a lively starter, and anyone who likes a surprising science fact.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Which wall-climbing lizards cannot stick to Teflon, the fluorine-based plastic that defeats their grip?
Geckos
Geckos grip walls using weak van der Waals forces, and Teflon's tightly held fluorine atoms resist those forces so well that a gecko's feet simply slide off.
Q 02In which TV drama does hydrofluoric acid, a fluorine compound, dissolve a body and then a bathtub?
Breaking Bad
Breaking Bad's second episode has Jesse skip the plastic bin Walt asked for, so the acid dissolves the tub as well and the ceiling below it collapses.
Q 03Hydrofluoric acid, a fluorine compound classed as a weak acid, famously dissolves which material?
Glass
Glass is mostly silica, which the acid converts into fluorine compounds that drift or wash away, so the acid has to be bottled in plastic instead.
Q 04Which sea predators have teeth of fluorapatite, the fluorine mineral that fluoride builds on human teeth?
Sharks
Sharks build the outer layer of every tooth from fluorapatite, a mineral that resists acid attack far better than the one in untreated human teeth.
Q 05The French chemist who first isolated fluorine also used an electric furnace to try making which gems?
Diamonds
Diamonds were his target in the electric arc furnace he helped develop, and he also found a new mineral in fragments of an Arizona meteorite.
Q 06Which James Cameron film shows a real rat breathing while submerged in a fluorine-based liquid?
The Abyss
The Abyss filmed the scene for real, and the same technique has been proposed for deep divers and for patients with badly damaged lungs.
Q 07Which popular drink's plant soaks up fluorine compounds from soil and releases fluoride when brewed?
Tea
Tea leaves build up fluoride as they age, so mature leaves hold 10 to 20 times as much as young leaves from the same plant.
Q 08The Manhattan Project used tons of fluorine to turn which metal into a gas for enriching bomb fuel?
Uranium
Uranium bonded to fluorine becomes a gas whose lighter, bomb-grade molecules can be sifted out, and large-scale fluorine production began for that job.
Q 09Which waterproof, breathable fabric is made by stretching Teflon, a fluorine-based plastic?
Gore-Tex
Gore-Tex was born in 1969 when Bob Gore gave a heated rod of the plastic a sudden yank and it stretched about 800% instead of snapping.
Q 10Fluorine-containing CFC gases from aerosol cans were banned for thinning which part of the atmosphere?
Ozone layer
Ozone layer damage showed up in the 1980s as a dramatic seasonal hole over Antarctica, which is slowly recovering now that the gases are phased out.
Q 11Which Procter & Gamble brand launched in 1955 as the first clinically proven fluoride toothpaste?
Crest
Crest grew out of a research project at Indiana University, and in 1960 the American Dental Association reported that it really did help prevent decay.
Q 12Fluoride, an ion of fluorine, strengthens which outer layer of teeth, the body's hardest substance?
Enamel
Enamel that takes up fluoride rebuilds itself partly as fluorapatite, which stands up to the acids made by mouth bacteria better than the original mineral.
Q 13Fluorine, bromine and iodine belong to which family of elements, whose name means salt former?
Halogens
Halogens react with metals to make salts, ordinary table salt among them, and fluorine is the lightest member of the family.
Q 21Fluorine scores 3.98, the highest of any element, on the Pauling scale of which chemical property?
Electronegativity
Electronegativity measures how strongly an atom pulls shared electrons towards itself, and fluorine's unmatched pull is why it reacts with almost everything.
Q 22Which faint color is pure fluorine gas, a shade that brightens when it condenses to liquid at −188 °C?
Pale yellow
Pale yellow fluorine has a biting smell that the nose can pick up at just 20 parts per billion, a useful warning given how toxic the gas is.
Q 23Which noble gas has never been seen to form a compound with fluorine, which reacts with almost every other element?
Neon
Q 14Which blockbuster antidepressant, known generically as fluoxetine, has three fluorine atoms per molecule?
Prozac
Prozac was one of the first antidepressants to act selectively on serotonin, sparing patients many of the side effects of older drugs.
Q 15Which family of fluorine compounds, used in stain-resistant coatings, is nicknamed forever chemicals?
PFAS
PFAS earned the nickname because their fluorine bonds are so stable that the compounds linger in the environment for a very long time.
Q 16Hydrofluoric acid, a fluorine compound, can kill by seeping through skin and binding which blood mineral?
Calcium
Calcium stripped from the blood can stop the heart, which is why these burns are treated straight away with calcium gluconate gel.
Q 17Fluorite, the main ore of fluorine, defines the value 4 on which scale used by geologists?
Mohs
Mohs scale ranks minerals by which can scratch which, so fluorite scratches calcite at 3 but is itself scratched by apatite at 5.
Q 18Fluorite, the mineral that gave fluorine its name, often glows when lit by which invisible light?
Ultraviolet
Ultraviolet light makes many fluorite crystals shine, and in 1852 George Stokes named the whole effect fluorescence after the mineral.
Q 19Which gemstone, the traditional November birthstone, has fluorine built into its crystal structure?
Topaz
Topaz is a silicate of aluminum and fluorine, and it is the state gem of Utah, where rockhounds dig crystals at Topaz Mountain.
Q 20Which French chemist isolated fluorine in 1886 and won a Nobel Prize for it twenty years later?
Henri Moissan
Henri Moissan succeeded by passing electricity through a chilled fluorine solution, and he died just two months after collecting the prize.
Neon has never yielded a fluoride, whereas radon reacts readily, krypton needs special conditions and even argon forms one fluorine compound in extreme cold.
Q 24Chemist Neil Bartlett used a fluorine compound to prove noble gases can react, starting with which gas?
Xenon
Xenon had defied every attempt at a reaction until Bartlett's 1962 experiment, a result that surprised many chemists.
Q 25Which heavy fluorine gas, used to insulate electrical switchgear, makes a voice sound much deeper when inhaled?
Sulfur hexafluoride
Sulfur hexafluoride is so much denser than air that it deepens the voice, the reverse of helium, and it is also the most potent greenhouse gas known.
Q 26Which 1987 treaty, the first ratified by every United Nations member, phased out fluorine-containing CFC gases?
Montreal Protocol
The Montreal Protocol has been ratified by 198 parties, and former UN chief Kofi Annan called it perhaps the single most successful international agreement.
Q 27Which English inventor of the miners' safety lamp damaged his eyes experimenting with fluorine compounds?
Humphry Davy
Humphry Davy got off lightly: the same fumes later killed two other chemists, and the injured researchers became known as the fluorine martyrs.
Q 28Which country is the biggest user of 1080, a fluorine-based poison air-dropped to kill invasive possums?
New Zealand
New Zealand has no native ground-based mammals to harm, and the same poison occurs naturally in at least 40 plant species as a defense against grazers.
Q 29Which 3M fabric protector was discovered when a fluorine-based liquid spilled on a lab worker's tennis shoe?
Scotchgard
Scotchgard began in 1953 when the splash on Joan Mullan's shoe refused to wash off, and chemists Patsy Sherman and Samuel Smith turned it into a product.
Q 30Which DuPont chemist discovered Teflon by accident when a cylinder of fluorine-based gas turned to white powder?
Roy Plunkett
Roy Plunkett was trying to make a new refrigerant in 1938 when the gas seemed to vanish, so he cut the cylinder open and found a waxy solid inside.