Chemical elements Éléments chimiques 23 elements (chemical substances) 19 Elements 14 Composés inorganiques 9 Inorganic compounds 9 Chemicals and Drugs 8 Chemistry 8 Inorganic Chemicals 8 SCIENCE 8 Inorganic 5 Chemical Actions and Uses 4 Chimie 4 Loi périodique 4 Periodic law 4 Phenomena and Processes 4 Classification périodique des éléments 3 Environmental Pollutants 3 Gases 3 Gaz 3 Metals 3 Métaux 3 Periodic table of the elements 3 Polluants 3 Pollutants 3 Pollution 3 Toxic Actions 3 gas (material) 3 metal 3 periodic table 3