Obscure Elements
Elements28 Sep 2016

Obscure Elements

In the final programme in our Elements series, Justin Rowlatt looks at the rarest and oddest members of the periodic table.

Selenium, bismuth, molybdenum, antimony, rhenium, hafnium, zirconium, tellurium, thallium, barium. What are they? And what are they used for?

Minor metals merchant Anthony Lipmann explains how he made a fortune tracking down a stockpile of one toxic element sufficient to kill millions of people - and sold it to Japanese camera manufacturers.

We set chemistry professor Andrea Sella a musical challenge to round off his elucidation of the periodic table, going out with a pyrotechnic bang.

And cosmologist Martin Rees explains why 85% of the matter in the universe isn't made up of chemical elements at all, but instead of "dark matter", whatever that is.

(Picture: Elements series planning board; Credit: Laurence Knight/BBC)

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Episoder(65)

Nitrogen (N) - explosives

Nitrogen (N) - explosives

Some 78% of the Earth's atmosphere is nitrogen. Yet this seemingly inert gas is the key component of bombs and explosives. It has brought life and death on an epic scale since mankind first unlocked i...

26 Jul 201435min

Carbon (C) - plastics

Carbon (C) - plastics

Polymers – or plastics – are enduring, cheap, mouldable and versatile. Yet their very durability mean they litter our landscapes. And their main raw material - crude oil - will not last forever. So co...

25 Jul 201434min

Sodium (Na)

Sodium (Na)

What links soap, paper, heart disease and murder? Sodium. In the latest in our series of programmes looking at the world economy from the perspective of the elements of the periodic table, Justin Rowl...

24 Jul 201432min

Chlorine (Cl)

Chlorine (Cl)

Chlorine is more than just a chemical used in swimming pools. This poisonous green gas is the great enabling element of the chemicals industry, used in creating your clothes, computer chips, medicines...

23 Jul 201433min

Lithium (Li)

Lithium (Li)

Lithium is the electro-chemical element - big in batteries and bipolar disorder. Over two decades it has shot from obscurity to become almost synonymous with the way we power our gadgets. Presenter Ju...

22 Jul 201432min

Rare Earth Elements (Ce, Nd, Dy, Er, etc)

Rare Earth Elements (Ce, Nd, Dy, Er, etc)

Neither rare nor earths, these 17 elements are nonetheless difficult and unpleasant to mine and refine. Chemically near-identical, these metals have unique magnetic and optical properties, making them...

21 Jul 201432min

Carbon (C) - diamonds

Carbon (C) - diamonds

Diamonds are not forever. They can be burned, and these days they can be mass-produced in a factory. So can your jeweller tell the difference between a natural and chemically identical "fake"? And can...

20 Jul 201431min

Calcium (Ca)

Calcium (Ca)

Calcium is the great structural element. It is the basis of much of the great architecture in nature as well as many of the incredible structures made by man. Presenter Justin Rowlatt hears from chemi...

19 Jul 201427min

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