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![](https://ichef.bbci.co.uk/images/ic/320x180/p02s5lmy.jpg)
Lead (Pb)
The sweetest of poisons, have we learnt how to handle this heavy metal?
![](https://ichef.bbci.co.uk/images/ic/320x180/p02s5lsh.jpg)
Caesium (Cs)
The caesium-based atomic clock has redefined the very meaning of time.
![](https://ichef.bbci.co.uk/images/ic/320x180/p01rt2f9.jpg)
Silicon
2/4 Is the element behind the computing revolution about to transform the world once again?
![](https://ichef.bbci.co.uk/images/ic/320x180/p02z3hh3.jpg)
Sulphur (S)
Does the world face a looming glut of this devilish yellow element?