This week, Graihagh Jackon drilled into John's question to try and find out what the most expensive element in the world is... But first, how do we define 'expensive?' Chemist Mark Lorch set us straight...
I cannot get a transcript of the show but I would assume it is antimatter that costs an awful lot to produce syhprum, Mon, 6th Jul 2015
Top of the league must be anti Hydrogen a vast amount of money has been spent to produce a few atoms syhprum, Tue, 7th Jul 2015
Not an element, admittedly, but back in the 1970's I bought some specialist subminiature thin-film thermistors which cost 400 times as much as moondust per gram.