About: http://webisa.webdatacommons.org/427758780

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	X is a hydrogen atom or a halogen atom, and is preferably a chlorine atom or a bromine atom; and M is a metal atom such as iron, cobalt, nickel, copper, platinum or the like.
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com