Nitrogen: The bringer of life and death
Mercury: A beautiful but poisonous metal
Why do we value gold?
Lithium: A metal that floats on oil and powers our phones
Chlorine: From toxic chemical to household cleaner
Tin: What the world owes this dull grey metal
Calcium, building block for the world
Sodium: Getting rid of dirt - and murder victims
Aluminium: The metal that just keeps on giving
The world's insatiable hunger for phosphorus
Is it right to waste helium on party balloons?