About: http://webisa.webdatacommons.org/399742876

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	M is a hydrogen atom, alkali metal atom, alkaline earth metal atom ammonium group, or substitutional ammonium group;
http://www.w3.org/ns/prov#wasQuotedFrom	google.com