Chlorine (Cl)

In the first of three programmes about iron, Justin Rowlatt explores two moments in industrial history that transformed this most abundant of metal elements into the key material out of which modern l...

18 Mar 201532min

Technetium is essential for medical imaging, yet supplies of this short-lived manmade element are far from guaranteed. We see a technetium scan in progress and a cow being milked, and hear the yarn of...

11 Mar 201531min

Itself a ferocious yellow gas, fluorine is also the key building block for a string of other gases that pose a threat to mankind - from the ozone-depleting CFCs to potent greenhouse gases. We track fl...

4 Mar 201542min

Chromium is the metal of modernity - spawning icons from the Chrysler Building to the Harley Davidson. This colourful element is the key ingredient in stainless steel and leather. But the shiny metal ...

26 Feb 201533min

Nickel is the metal that made the jet age possible, not to mention margarine and bicycle sprockets. We visit Rolls Royce to discover the incredible materials science that this chemical element and its...

18 Feb 201534min

Uranium is the fuel for nuclear power stations, which generate carbon-free electricity, but also radioactive waste that lasts a millennium. In the latest in our series looking at the world economy fro...

8 Okt 201441min

Lead is the sweetest of poisons, blamed for everything from mad Roman emperors to modern-day crime waves. Yet a lead-acid battery is still what gets your car going in the morning. So have we finally l...

1 Okt 201438min

The atomic clock runs on caesium, and has redefined the very meaning of time. But it has also introduced a bug into timekeeping that affects everything from computerised financial markets to electrici...

24 Sep 201438min