For all articles on chemical elements: pure chemical substances consisting of one type of atom distinguished by the number of protons in its nucleus.
“ Lead (chemical symbol Pb) is a chemical element; a soft, malleable heavy metal. Lead has a...Lead
“ Oxygen (chemical symbol: O) is a chemical element. In nature, at standard temperature and...Oxygen
“ Iodine (chemical symbol: I) is a chemical element, and a halogen. Iodine and its compounds are...Iodine