SWEET Ontology 2.3 chem:Chemical chem:TraceSubstance elem:Actinoid elem:AlkaliMetal elem:AlkalineEarthMetal elem:Atmophile elem:Chalcogen elem:Chalcophile An element such as copper that forms sulphide minerals if sufficient sulphur is available. elem:ChemicalElement elem:Element A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus. The term is also used to refer to a pure chemical substance composed of atoms with the same number of protons. [Wikipedia] elem:Ha elem:Halogen elem:HeavyMetal elem:Lithophile elem:Metal A metal is a chemical element whose atoms readily lose electrons to form positive ions (cations), and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms.[Wikipedia] elem:Metalloid elem:NobleGas elem:Nonmetal elem:PostTransitionMetal elem:Prictogen elem:RareEarthElement elem:Siderophile elem:TraceMetal elem:TransitionMetal 14 13 22 18 42 33 6 5 5 4 35 45 6 6 20 20 48 65 24 28 17 18 29 34 10 9 26 30 1 0 2 2 121 80 74 53 19 20 4 3 12 12 30 25 54 42 7 7 12 11 10 10 8 8 15 16 125 82 136 86 16 16 71 51 45 34 18 14 142 90 146 92 34 30 2.3 SWEET Ontology 2.3