Rubidium is a reactive metal with few uses, n...
Ruthenium is a 'sort of' precious metal that ...
Samarium magnets are used in headphones & gui...
Predicted by Mendeleev & useful for alloying ...
New Zealand soils lack the vital element sele...
Silicon is a blockbuster metalloid with many ...
Silver is widely used in jewellery, has inter...
Sodium is vital for life & usually found in c...