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Showing posts with label chemistry. Show all posts
Showing posts with label chemistry. Show all posts

26 June 2016

10 Chemical Element Names


So a lot of very big things have happened this week. For one, the UK voted to leave the European Union for some reason. Secondly, the shelves on the HH bookcase were starting to sag a bit in the middle, so they were rotated. And thirdly, the four new chemical elements discovered at the start of the year were given their names.


One of those stories is of much higher import than the others, of course, but don’t worry—those shelves will be fine. As for those chemical elements, well, the names chosen were nihonium, moscovium, tennessine and oganasson. Each has a story attached to it: the first three honour their places of discovery, Japan, Moscow and Tennessee respectively, while the last honours Russian-Armenian physicist Professor Yuri Oganessian.

Elsewhere on the periodic table, however, there are another 114 elementary etymologies to tell—although we only had enough time (and bandwidth) to talk about 10 in this week’s video…




Of course Yuri Oganessian and (SPOILER ALERT in case you haven’t watched the video) Vasili Samarsky-Bykhovets aren’t the only eponymous honourees on the periodic table. Elements like einsteinium, curium, bohrium and seaborgium honour some of the most famous names in science. 

Nor are nihonium, moscovium and their neighbours the only geographical namesakes: besides tennessine, America can offer berkelium and californium, as well as americium, while the UK has strontium, which takes its name via the mineral strontianite from the village of Strontian in the Scottish Highlands. And then there’s gallium, element number 31, which uniquely manages to honour both its place of discovery and—if the rumours are trumours—its discoverer.

The father of the periodic table, Dmitri Mendeleev (who has the element mendelevium named after him), predicted the existence of gallium in 1871, but it wasn’t until four years later the snappily-named French chemist Paul Émile Lecoq de Boisbaudran obtained a sample of it from the mineral sphalerite. The metal de Boisbaudran discovered was bright silver and brittle, and melted just above room temperature. He called it gallium, from Gallia, the Latin name for the Roman territory of Gaul, corresponding to modern-day France. But it’s possible he had other ideas in mind.

One of de Boisbaudran’s many, many names, Lecoq, means “the rooster” in French, while the Latin word for “rooster” is gallus. Had de Boisbaudran wryly named gallium after himself? Some fellow scientists at the time accused him of such, but he insisted that the connection was purely coincidental. Even if it was, it’s certainly a very convenient one and makes de Boisbaudran an interesting footnote to the dozens of famous names honoured on the periodic table. 



10 February 2016

Uranus

Before we begin, let’s get a few things out of the way. The noxious atmosphere around Uranus could kill a man. Uranus has a circumference of 100,000 miles. Scientists are looking at a black hole near Uranus. What are those two circular objects either side of Uranus? Ass-teroids, of course. If you got through that without laughing, then we’re good to go.

So. The other day, one of those stop-you-in-your-tracks facts cropped up on the @HaggardHawks Twitter feed:


But this really is too bizarre a fact to leave unexplained:


…so your wish is my command.

The discovery of Uranus (stop sniggering, you at the back) is credited to the German-born English astronomer William Herschel in 1781. Although it had been observed by scientists and astronomers for centuries, Uranus had always been mistaken for a star, and right up to Herschel’s discovery it was still being classed as 34 Tauri, a minor star in the constellation Taurus. Even Herschel himself initially believed he had spotted a comet rather than a planet, after noting that an object he had been looking at from his observatory in Bath had changed position in the sky over a series of nights.

Herschel announced his discovery in March 1781. As word of his new “comet” spread, astronomers all across Europe began to take note and observe it themselves. Soon, enough data had been compiled to plot its apparent trajectory—which, to everyone’s surprise, appeared to be an almost perfect circular orbit around the Sun. Herschel’s discovery was no comet.

Full colour photo of Uranus. Stop laughing.

By 1783, it had become universally acknowledged that Herschel’s discovery must surely be a planet—moreover, it was the first planet ever discovered by telescope, and the first new planet added to our Solar System in modern history. It was a truly monumental discovery, and one that earned Herschel an annual salary of £200 (equivalent to £27,000/$40,000 today) from King George III (on the condition that he move his observatory from Bath to Windsor, to be closer to the royal household), as well as the never-to-be-repeated title of Court Astronomer to The King.

But with the existence of a new planet confirmed, a pressing question soon emerged: what on Earth should it be called?

The Astronomer Royal, Nevil Maskelyne, wrote to Herschel asking him “to do the astronomical world the favour” and “give a name to your planet,” which, he continued, “is entirely your own, [and] which we are so much obliged to you for the discovery of.” In honour of his new financial patron, Herschel plumped for the only name he saw fit: Georgium Sidus, or “George’s Star.” He wrote to the Royal Society:

In the fabulous ages of ancient times the appellations of Mercury, Venus, Mars, Jupiter and Saturn were given to the Planets, as being the names of their principal heroes and divinities… The first consideration of any particular event, or remarkable incident, seems to be its chronology: if in any future age it should be asked, when this last-found Planet was discovered? It would be a very satisfactory answer to say, “In the reign of King George the Third”.

The seventh planet from the Sun, ultimately, was to be called George. But the response to Herschel’s suggestion was far from encouraging.

Outside of Europe, astronomers were wary of using a such an explicitly “British” name, especially given that it had taken an international collaboration to prove its status as a planet. Consequently, despite Maskelyne specifying that Herschel’s discovery and his choice of name were “entirely his own”, George failed to gain any widespread use or permanency. The name Georgium Sidus effectively became a placeholder, and over the years that followed astronomers across Europe began utilising and pitching their own choices and suggestions.

One popular choice was simply Herschel, a name honouring its discoverer. The Swedish astronomer Erik Prosperin ironically opted for Neptune (now the name of the eighth planet, discovered in 1846). But eventually a clear choice emerged—namely the German astronomer Johann Elert Bode’s suggestion, Uranus.

Bode had been one of the European astronomers who had calculated Uranus’ orbit, lending weight to the idea that Herschel’s discovery was a planet not a star. He suggested the name Uranus as it not only maintained the classical and mythological theme set out by the other six planets, but fittingly Uranus was the Greek god of the sky. Moreover, just as Saturn had been the father of Jupiter, Uranus was the father of Saturn, thereby creating a mythological family tree in the heavens.

Bose’s choice quickly gained momentum, and was reinforced by the German chemist Martin Klaproth in 1789, who named his famous discovery—the chemical element uranium—in support of Bose’s suggestion.

Out of deference to Herschel, however, it took another 60 years for the name Uranus to be universally acknowledged by the scientific community, when, in 1850, the official astronomical almanac published by the Royal Greenwich Observatory in London finally abandoned Herschel’s Georgium Sidus and in favour of Uranus.




18 September 2015

Aluminium


This week over on @HaggardHawks, this intriguing little fact popped up: 
As a couple of diligent followers pointed out, yes, we’re only talking about English here. And yes, Q is also entirely absent from all 118 names. And, in case you’re wondering, there are Zs in zinc and zirconium, and Xs in xenon, oxygen and ununhexium (at least until it was renamed livermorium in 2012).

But with the New Scientist Twitter feed now seemingly muscling in on HaggardHawks’ patch (I can sense the geekiest showdown in internet history brewing already), now seems like the perfect time to spread our wings and try a little bit of science ourselves—albeit from a dictionary-orientated viewpoint.

So. All this talk of chemical elements raises an interesting question: why is it aluminium in Britain, and aluminum in America?

There’s an old story that claims a sizeable shipment of aluminium was once imported into the United States from Europe, but when it was recorded in the logbook of whatever port it arrived at, it was misspelled aluminum by the local harbourmaster (or harbormaster, as the case may be). It’s a neat story, but a fairly unrealistic one—would a mistake like this really be enough to alter the spelling of a word in an entire regional variety of English? It’s unlikely. Is this tall-tale probably a complete fabrication? That’s very likely. So what’s the truth?

Well, like a lot of the perceived differences between British and American English (we’re looking at you, zed vs. zee), things here haven’t always been as clear cut as they are today. Brace yourselves, then—here comes the science bit.



Minerals containing aluminium have been known and used since antiquity, but it wasn’t until the late eighteenth century that scientists began to realise that alums—naturally-occurring aluminium minerals, once used to do everything from dressing wounds to dyeing fabrics—all contained some kind of as-yet-undiscovered base metal. This metal was tentatively given the name alumine by the French chemist Guyton de Morveau in 1761, but it wasn’t until 1807 that the great Sir Humphrey Davy used his newly-refined process of electrolysis to try to isolate it from its mineral source.

Although he failed, in writing up his experiments Davy nevertheless discussed this tantalizingly unobtainable metal in English for the first time. As his paper, published in the Royal Society’s Philosophical Transactions the following year, explained:
Had I been so fortunate as to have obtained more certain evidences on this subject, and to have procured the metallic substances I was in search of, I should have proposed for them the names silicium, alumium, zirconium and glucium.
Confusingly, Davy’s list of the metals that eluded him—silicium (now silicon), alumium, zirconium and glucium (now beryllium)—means that the earliest written record we have of in English is neither spelled aluminium nor aluminum. At least that was until 1812, when Davy published a book cataloguing all of his discoveries to date, in which he stated:
This substance [alum] appears to contain a peculiar metal, but as yet Aluminum has not been obtained in a perfectly free state, though alloys of it with other metalline substances have been procured sufficiently distinct to indicate the probable nature of alumina.
This appears to give the American spelling aluminum the edge—but, confusing things even further, there’s this:
The result of this experiment is not wholly decisive as to the existence of what might be called aluminium and glucinium.
This final quote comes from an 1811 review of a lecture given by Davy at the Royal Society in London, two years earlier. Whether Davy himself had used the name aluminium in his lecture or whether it was merely the reviewer’s name of choice is impossible to tell, but one thing is clear: Davy, it seems, couldn’t make his mind up—and he was by no means alone.

While Davy’s original spelling alumium quickly dropped out of use, in the years that followed his experiments the names aluminium and aluminum were used interchangeably in both British and American literature, as well as by Davy himself. And all this confusion wasn’t helped by the fact that, because isolating aluminium was proving so problematic, the metal itself remained astonishingly scarce. In fact, for much of the nineteenth century aluminium was one of the rarest and most expensive metals in the world: in the 1850s, Emperor Napoleon III of France reportedly had a set of cutlery cast from aluminium that he reserved for only his most important guests, while everyone else had to make do merely with gold. The need to mention aluminium in print consequently remained small, and so a standardized form of the word failed to emerge.


Napoleon III: Expensive tastes, exceptional moustache

When Noah Webster published his American Dictionary of the English Language in 1828, however, the only spelling that made his final cut was aluminum; because aluminium was still so rare at the time, it’s possible that Webster’s preference for aluminum was an attempt to ally it more closely to  platinum, another equally rare and equally precious metal. Back in Europe meanwhile, the trend drifted the other way: the Latin-inspired –ium endings common to many of the other recently-discovered elements (including a number of those isolated by Davy’s more successful experiments) led to the spelling aluminium steadily gaining ground among classically-educated scholars in Britain. 

But the breaking point eventually came from the unlikeliest of places: behind a shed in the garden of a family home in northern Ohio.

In the early 1880s, an American chemist and inventor named Charles Martin Hall began experimenting with samples of alumina—solid aluminium oxide—to find a cheaper method of producing pure aluminium. Having constructed his own coal-powered furnace in his family’s garden in Oberlin, Ohio, Hall came up with a process in which alumina is dissolved in a bath of molten cryolite (a pale, quartz-like mineral), which is then electrolysed to produce a pool of pure molten aluminium at the bottom of the tank.

For the first time in history, Hall’s method—which was simultaneously discovered by the French chemist Paul Héroult, and is hence called the Hall-Héroult Process—allowed aluminium to be mass produced; within a matter of years of his process being patented in the United States, pure aluminium was reportedly 200 times cheaper than it had ever been before.

Although Hall used the spelling aluminium when filing the patent for his process, in his advertising and promotional material he opted for Webster’s spelling of aluminum. And as his business grew, and as his technique for producing pure aluminium became more widespread, this meant that aluminum steady established itself as the metal’s preferred spelling in North America, while the classical –ium ending remained in place back in Britain—a distinction that has remained in place ever since.