Sodium Trivia
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50 free Sodium trivia questions with answers — science & nature quiz, new questions added Aug 2026.
Sodium trivia for chemistry students, pub-quiz teams and anyone who has watched a lump of it fizz across a lab sink. This quiz covers the element itself: atomic number 11, the soft silvery metal you can cut with a knife and must keep under oil, the single stable isotope, the Arabic and Egyptian words behind 'sodium' and 'Na', and Humphry Davy's 1807 experiment that first isolated it. It explains the yellow flame and the D line that lights up street lamps and laser guide stars, and the Downs cell that makes the metal today. It then moves to the compounds and the biology: table salt, baking soda, washing soda, lye and soap, natron and mummies, MSG and umami, the sodium-potassium pump that eats a fifth of your energy, hyponatremia in marathon runners, and daily intake limits. It closes with sodium in industry and history: fast-reactor coolant, engine valves, airbags, the Solvay process, Wieliczka's salt mine and Gandhi's Salt March. Questions range from easy to expert, and every answer was checked against a reference page and carries its source. If you enjoy this quiz, try our periodic table, chemistry and salt quizzes next.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Sodium, element 11, comes just after which noble gas?
Neon
Neon: sodium's eleventh electron sits alone in an outer shell and is lost with great ease, which is why the metal reacts so fiercely and never occurs free in nature.
Q 02Which chemical symbol stands for sodium?
Na
Na, from the Latin name natrium, which goes back to a soda salt gathered from dry lake beds in the ancient world; German, Dutch and the Scandinavian languages still call the element Natrium.
Q 03Eating too much sodium over the years is most strongly linked to which condition?
High blood pressure
High blood pressure: sodium makes the body hold on to water, and the extra fluid pushes harder on vessel walls, raising the risk of heart disease and stroke.
Q 04Who first isolated sodium metal in 1807?
Humphry Davy
Humphry Davy ran current from a powerful battery through a molten compound at London's Royal Institution in October 1807, just as he had done shortly before to free potassium.
Q 05Which Swedish chemist devised today's letter symbols for the elements, publishing sodium's in 1814?
Jons Jakob Berzelius
Jons Jakob Berzelius abbreviated each element's Latin name to one or two letters, which is why several symbols, sodium's among them, look nothing like their English names.
Q 06How is bulk sodium metal usually stored?
Under oil or an inert gas
Under oil or an inert gas, because bare sodium tarnishes within seconds in air and reacts violently with moisture; the metal is soft enough to cut with a knife.
Q 07What colour does sodium give to a flame?
Yellow
Yellow: the glow is so strong that a trace of sodium can drown out other metals' colours, so chemists view flame tests through blue cobalt glass to filter it out.
Q 08Which German physicist gave sodium's 'D' line its letter in 1814 while mapping dark lines in sunlight?
Joseph von Fraunhofer
Joseph von Fraunhofer lettered the boldest of the hundreds of dark lines he charted; decades later Kirchhoff and Bunsen matched his D line to sodium, showing that the Sun holds earthly elements.
Q 09What does a lump of sodium metal do when dropped into a bowl of water?
Floats and fizzes about
Floats and fizzes about: sodium is slightly less dense than water, so it stays on the surface while it reacts violently. Only lithium and potassium are lighter metals.
Q 10Sodium is forged inside massive stars when two nuclei of which element fuse, once their helium is spent?
Carbon
Carbon: two carbon nuclei merge at hundreds of millions of degrees and shed a proton, leaving sodium. The Sun is far too small ever to burn carbon this way.
Q 11Sodium, the sixth most abundant element in Earth's crust, is the commonest of which family?
Alkali metals
Alkali metals: sodium makes up more than 2% of the crust, yet it is so reactive that none of it occurs as free metal; it is all locked in minerals such as feldspar.
Q 12Sodium metal melts at about the temperature of what?
Boiling water
Boiling water: sodium melts at about 98 °C because each atom lends only one electron to the bonds holding the metal together. Its heavier cousin caesium melts at about 28 °C.
Q 13What two products form when sodium metal reacts with water?
A hydroxide and hydrogen gas
Q 21Highly efficient low-pressure sodium lamps spent decades lighting what?
City streets
City streets: the lamps turn electricity into light very efficiently, but nearly all of it is a single wavelength, so objects beneath them lose their colours and look alike.
Q 22Astronomers fire lasers at a layer of sodium atoms 90 km up to create an artificial what?
Star
Star: the sodium, shed by meteors burning up, glows where the beam strikes it, giving telescopes a reference point they use to cancel out the blurring of turbulent air.
Q 23Sodium has been detected in the thin exospheres of the Moon and which planet?
Mercury
Mercury has no true atmosphere, only a thin haze of atoms blasted off its surface by the solar wind and meteoroids. Sunlight then pushes some of them into a faint comet-like tail.
A hydroxide and hydrogen gas: the heat can set the hydrogen alight, and high-speed film suggests the blast begins when the metal sheds electrons so fast that its surface bursts apart.
Q 14Squeezed to millions of atmospheres of pressure, sodium metal becomes what?
A clear transparent solid
A clear transparent solid: the pressure forces sodium's free electrons into the gaps between its atoms, so the shiny metal stops conducting and lets light pass through like glass.
Q 15Sodium metal is made by passing electricity through molten table salt, which also releases which gas?
Chlorine
Chlorine: the current splits salt into its two elements in a Downs cell, where iron baffles keep the molten sodium and the gas apart so they cannot recombine.
Q 16Metallic sodium was first made commercially in the 19th century as a step in producing which other metal?
Aluminium
Aluminium: in Deville's process sodium stripped the metal out of its salts, until the Hall-Héroult electric process made aluminium cheap and ended the demand for sodium.
Q 17Sodium's alloy with potassium is notable for being what at room temperature?
A liquid
A liquid: each metal is solid on its own, yet the right mix stays runny down to about −12 °C, so it is pumped through pipes as a coolant that will not freeze.
Q 18Molten sodium is used as the coolant in which type of nuclear power plant?
Fast neutron
Fast neutron reactors: sodium's high boiling point lets them run hot at ordinary pressure, but the coolant burns in air and reacts violently with water, so any leak is a serious hazard.
Q 19Idaho's EBR-I, cooled by a sodium-potassium alloy, became in 1951 the first nuclear reactor to do what?
Generate electricity
Generate electricity: on 20 December 1951 its output lit four light bulbs, and it later powered its whole building. It was built to test whether a reactor could breed more fuel than it burned.
Q 20In high-performance engines, sodium is sealed inside which component to carry heat away?
Poppet valve stems
Poppet valve stems: the sodium melts inside the hollow exhaust valve and carries heat from the scorching valve head up to the cooler stem.
Q 24Rock salt is the everyday name for which mineral, the natural form of table salt?
Halite
Halite forms thick beds where ancient seas dried up. Buried deep, the salt can slowly flow, pushing up through the rock above as salt domes that often trap oil.
Q 25Since the 1920s, table salt has commonly been fortified with which element to prevent goitre?
Iodine
Iodine: the thyroid needs it to make its hormones, and without enough the gland swells into a goitre. Switzerland began adding it to salt in 1922 and the United States followed in 1924.
Q 26Most of the sodium in the American diet comes from which source?
Packaged and restaurant food
Packaged and restaurant food supplies more than 70% of it, so the salt shaker is only a minor player. Bread and cold cuts are among the biggest contributors.
Q 27The sodium-potassium pump pushes three sodium ions out of a cell using one molecule of which energy carrier?
ATP
ATP: each molecule buys three sodium ions out and two potassium ions in, and the pumps work so constantly that at rest they burn about a third of all the ATP the body makes.
Q 28Which part of the body decides how much sodium to keep and how much to shed?
The kidneys
The kidneys strain sodium out of the body's fluids and then take most of it back. When pressure or sodium runs low, hormones such as aldosterone tell them to reclaim even more.
Q 29The sudden inflow of sodium ions into a nerve cell through voltage-gated channels produces what?
An action potential
An action potential: sodium flooding in flips the cell's charge for about a thousandth of a second, and the spike races along the nerve. Lidocaine numbs by blocking those channels.
Q 30Marathon runners risk hyponatremia, a dangerous sodium imbalance, by doing too much of what?
Drinking water
Drinking water faster than the body can shed it dilutes the sodium in its fluids below about 135 mmol/L. Water then seeps into cells and swells them, which is most dangerous in the brain.