_:nfd70287e8cb94147a4de6335d3210726xb7
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://edurev.in/studytube/Mindmap-Classification-of-Elements-Periodicity-in-/31d36c5d-396f-4cbe-877a-b9d27a542a4c_t>