About: http://webisa.webdatacommons.org/247753112

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 an element from the first or second main group, such as Li, Na, K, Mg, Ca, Sr or Ba;
http://www.w3.org/ns/prov#wasQuotedFrom	google.com