Everything Everywhere Daily: History, Science, Geography & More - Sodium: The Dangerous Yet Vital Element

Episode Date: June 18, 2026

Tell me your favorite episode for the 6th anniversary show!It is a metal that can explode in water, a part of a mineral that helped build empires, and an ion that allows your nerves to fire and your muscles to move.  It has helped preserve food, shaped trade routes, powered industries, and become one of the most common substances in kitchens around the world.  Few elements are more ordinary, more essential, or more chemically explosive.  Learn more about sodium on this episode of Everything Everywhere Daily. Sponsors Saily Get an exclusive 15% discount on Saily data plans! Use code everythingeverywhere at checkout. Download Saily app or go to https://saily.com/everythingeverywhere ButcherBox Get your choice between chicken breast or top sirloin for a year OR ground beef for life, PLUS $20 off when you go to ButcherBox.com/everything Quince Go to quince.com/daily for 365-day returns, plus free shipping on your order! Mint Mobile Save 50% on Unlimited premium wireless plans starting at $15/month at MintMobile.com/EED TrueWerk Get 15% off your first order at truewerk.com with code everything DripDrop Go to dripdrop.com and use promo code everything for 20% off your first order! Subscribe to the podcast!  https://everything-everywhere.com/everything-everywhere-daily-podcast/ -------------------------------- Executive Producer: Charles Daniel Associate Producers: Austin Oetken & Cameron Kieffer   Become a supporter on Patreon: https://www.patreon.com/everythingeverywhere Discord Server: https://discord.gg/Ds7Rx7jvPJ Instagram: https://www.instagram.com/everythingeverywhere/ Facebook Group: https://www.facebook.com/groups/everythingeverywheredaily Twitter: https://twitter.com/everywheretrip Website: https://everything-everywhere.com/  Disce aliquid novi cotidie Learn more about your ad choices. Visit megaphone.fm/adchoices

It is a metal that's part of a mineral that help build empires, an ion that allows your nerves to fire and your muscles to move, and it's found in your kitchen. It's helped preserve food, shape trade routes, powered industries, and become one of the most common substances around the world. Yet, when it's in its elemental form, it can literally be explosive. Learn more about sodium. On this episode of Everything Everywhere Daily. Shopping for a car should be exciting. Not exhausting. But let's be honest.

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If you have questions or concerns about your gambling or someone close to you, please contact connects Ontario at 1-866-531-2,600 to speak to an advisor. Free of charge. BetMGM operates pursuant to an operating agreement with eye-gaming Ontario. Terrio. Sodium is one of the most familiar chemical elements in daily life, even though almost no one encounters it in its pure metallic form. It's the element behind table salt, baking soda, sodium vapor lamps, lie, many industrial chemicals, and one of the most important electrical signals in the human body. And it's also a good example of how an element can be violently

reactive in isolation, yet essential and harmless when bound into common compounds. Sodium sits in Group 1 on the left side of the periodic table with an atomic number of 11 and a single electron in its outermost shell. And that lone valence electron is the key to nearly everything about sodium's behavior. Because its outermost electron is held loosely by the nucleus, sodium readily gives it up to form a positively charged ion, thereby achieving a stable electron configuration. This eagerness to lose an electron makes sodium intensely reactive and a strong reducing agent. Pure sodium is a soft silvery metal. In fact, it's so soft that it can be cut with a knife.

When freshly cut, it has a shiny metallic surface, but it quickly tarnishes in the air as it reacts with oxygen and moisture. It has a relatively low boiling point for a metal at about 97.8 degrees Celsius, which means that it melts just below the boiling point of water. And it's also light with a density lower than water, so a piece of sodium would actually float. Perhaps the most famous property of sodium is its reaction with water. Pure sodium reacts with water to form sodium hydroxide and hydrogen gas. This reaction releases a lot of heat. The heat can ignite the hydrogen gas, which is why sodium thrown into water,

may fizz, skate around the surface, catch fire, or even explode if enough hydrogen and heat build up. And this isn't just a chemistry class stunt. It is a direct consequence of sodium's eagerness to lose its outer electron. There are many videos online that show the reaction of sodium and water, and it's pretty violent. In fact, all group one elements behave this way, and the heavier the element, the more reactive it becomes. Because sodium is so reactive, it's never found naturally as a free metal. Instead, it's always found in compounds, especially salts. The most important is sodium chloride or ordinary table salt. Despite humans having used sodium compounds for thousands of years, we had no idea that sodium was a thing or an element. The key breakthrough came in 1807, when the English chemist Humphrey Davy isolated sodium, by electrolyzing molten sodium hydroxide. By passing an electric current through molten compounds,

he was able to break them apart into their elemental components. In the same period, he also isolated potassium, calcium, strontium, barium, and magnesium. The name sodium is derived from the Latin word, Sodonym, which refers to a headache remedy made from a sodium-rich plant, while its chemical symbol, N-A, comes from Natrium. the Latin name used in some European languages and ultimately adopted as the official chemical symbol. Sodium is usually ranked as the sixth most abundant element in the earth's crust by weight after oxygen, silicon, aluminum, iron, and calcium. Sodium makes up roughly 2.3 to 2.8% of the Earth's crust

by weight, depending on the source and estimate. Because it can't be found in its pure form in nature, It occurs in minerals such as felspars, rock salts, and soda minerals, as well as in dissolved sodium ions in seawater. Sodium chloride, aka table salt, is the most famous sodium compound, and I've already done an episode on the subject. However, it is far from the only important compound. Sodium hydroxide, also known as caustic soda or lye, is a powerful base used in soap making, paper production, drain cleaners, and many chemical processes. Sodium carbonate or soda ash is used in glassmaking, detergents, and water treatment. Sodium bicarbonate or baking soda is used in baking as an antacid, in fire extinguishers, and for odor control. Sodium hypochlorate is the active ingredient in many household bleaches.

And sodium nitrate has been used as a fertilizer and as a preservative. Sodium compounds are everywhere because sodium ions are stable, soluble, and easy to work with. And this is perhaps the biggest paradox of sodium. In its pure form, it's extremely reactive and dangerous, but as an ion, it's very stable. In nature, sodium plays several roles. Geologically, it is a part of the rock cycle and the ocean's chemistry. Sodium is weathered out of rocks, carried by rivers, and eventually accumulates in seas, lakes, salt flats, and evaporate deposits. In dry regions, sodium salts can accumulate in soils, sometimes, causing problems for agriculture by damaging soil structure and interfering with plant growth.

Biologically, sodium is essential for all animals. In humans and other animals, sodium ions help regulate fluid balance, blood volume, nerve impulses, and muscle contraction. Nerve cells use sodium and potassium gradients to generate electrical signals. When a nerve impulse travels down a neuron, sodium channels start to open. Sodium ions then rush into the cell and the electrical charge changes. This is one of the basic mechanisms that allows thought, sensation, movement, and your heartbeat. Sodium is also central to the body's water balance, where sodium goes, water tends to follow. This is why sodium affects blood pressure and fluid retention.

The kidneys carefully regulate sodium levels, conserving it when intake is low and excreting it when intake is high. Hormones such as aldosterone also help to control sodium levels. Humans do need sodium, but not in large amounts. Too little sodium can result in hyponatremia, a dangerous condition in which blood sodium levels fall too low. This can happen from severe illness, excessive water intake, certain medications, or extreme endurance exercise without proper electrolyte replacement. Symptoms can include headache, confusion, nausea, seizures, and in severe

cases, even death. However, too much sodium, especially over long periods of time, is also a problem. High sodium intake is associated with increased blood pressure in many people, and high blood pressure raises the risk of heart disease, stroke, and kidney disease. The main source of excess sodium in modern diets is usually not the salt shaker, but processed foods, restaurant meals, cured meats, soups, sauces, snacks, and packaged food. In the industrial world, sodium is enormously important. The largest sodium-related industry is salt itself. Sodium chloride is mined from underground deposits, extracted from seawater, or produced from brines.

It's used for food, road de-icing, water softening, animal feed, and chemical manufacturing. Salt is also the starting point for the chloral alkali industry, which uses electrolysis of brine to produce chlorine gas, hydrogen gas, and sodium hydroxide. These products feed into plastics, disinfectants, paper, textiles, detergents, pharmaceuticals, and many other industries. One of the most promising uses for sodium is as a coolant in certain nuclear reactor designs. Once melted, it is excellent at dissonance. dissipating heat from the reactor core. These are usually called sodium-cooled fast reactors or

SFRs. They are different from the ordinary water-cooled reactors used in most commercial nuclear power plants today. In a conventional reactor, water does two jobs. It carries heat away from the core and it slows down neutrons. Slowed-down neutrons are called thermal neutrons and they're very effective at sustaining fission in the kind of fuel most reactors currently use. In a sodium-cooled fast reactor, the goal is different. The reactor is designed to use fast neutrons, meaning neutrons that are not slowed down very much. Sodium is useful because it transfers heat well, but it does not significantly moderate or slow neutrons. That allows the reactor to operate in a fast neutron spectrum. Fast reactors can make more complete use of uranium,

fuel and potentially consume plutonium and other long-lived isotopes from spent nuclear fuel. Sodium has also been used in electric lighting. Sodium vapor lamps are gas discharge lamps that produce light by passing an electric current through sodium vapor. They're best known as the old yellow-orange streetlights that gave many roads, parking lots, tunnels, and industrial areas their distinctive nighttime color. They come into main types. low-pressure sodium, and high-pressure sodium. A low-pressure sodium lamp contains a discharge tube with a small amount of metallic sodium and starter gases such as neon or argon.

When the lamp first turns on, the starter gases glow reddish or pink. As the lamp warms up, the sodium vaporizes, and the light shifts to a very strong yellow orange. That weakness, the color, was also part of its strength. Low-pressure sodium lamps were extremely efficient. They produced a lot of visible light for each watt of electricity, making them attractive for street lighting, highways, security lights, ports, and industrial yards. Sodium lamps began being used widely for street lighting beginning in the 1930s,

largely because of their efficiency and because their yellow light performed well in fog. A high-pressure sodium lamp works on the same basic principle, but under higher pressure and temperature. Its arc tube is commonly made from translucent alumina because hot sodium is chemically aggressive and would attack ordinary glass. High-pressure sodium lamps also often contain mercury and other materials that broaden the spectrum.

The result is still yellow-orange, but not as bad as low-pressure sodium lamps. While sodium vapor lights were very popular during the 20th century, they've been disappearing rapidly over the last several decades. And the reason is actually pretty simple. The yellow light from sodium vapor lamps was tolerable because they were so power efficient. LED streetlights on the other hand use even less energy, last longer, switch on instantly, work well with dimming and smart controls, and can provide

a more natural color. The shift from sodium vapor to LED street lights has dramatically changed what many cities look like at night. An aerial image of Chicago at night, and night taken in the 1990s shows a massive yellow grid. That same photo taken today is now a completely different color. Finally, metallic sodium is useful for removing reactive elements such as oxygen, chlorine, sulfur, and other non-metals from a compound. One particular application is the purification of metal. When titanium tetrachloride is exposed to metallic sodium, the sodium will strip away the chlorine, leaving metallic titanium behind. Likewise, if you took some metal oxide, such as iron oxide, aka rust,

the sodium could strip away the oxygen leaving behind a pure metal and sodium oxide, also known as soda. Sodium as an element is not rare, exotic, or glamorous, but it is one of the truly foundational elements of civilization. The oceans are full of it, our bodies need it, it's found in our kitchens, and it might even have great use in nuclear reactors in the future. Yet there are problems with consuming too much or too little of it, and in its elemental metallic form, it can be extremely dangerous. And all of these things are true simultaneously due to the dual nature of sodium.

The executive producer of Everything Everywhere Daily is Charles Daniel. associate producers are Austin Otkin and Cameron Kiefer. My big thanks go to everyone who supports the show over on Patreon. Your support helps make this podcast possible. And I also want to remind everyone about the community groups on Facebook and Discord. That's where everything happens that's outside the podcast. And links to those are available in the show notes. As always, if you leave a review on any major podcast app or in the above community groups, you too can have it read in the show.