About: http://webisa.webdatacommons.org/107127475

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	None of the elements heavier than lead has any stable isotopes, but lighter elements can also exist in unstable, radioactive, forms, such as carbon-14.
http://www.w3.org/ns/prov#wasQuotedFrom	wisegeek.org