== Aqua ions == 

 My first draft is now ready at . Please have a look at it an edit/comment as you see fit. I've run out of ideas on  
 *lead 
 *occurence in nature/ uses 
 *categories 
 *more pictures 

 Spelling is a bugbear. I have run a spell-checker, but my typing is terrible, so I expect some errors to have been missed.