Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/3606004
Is Reference of Van Arkel protactinium-en#Sense
Protactinium Van Arkel-fr#Sense
Van Arkel-Proctatinium-de#Sense
Van Arkel protaktinium-da#Sense
Van Arkel-protactinium-nl#Sense
Πρωτακτίνιο Van Arkel-el#Sense
Protoattinio Van Arkel-it#Sense
Protactínio Van Arkel-pt#Sense