Example image of eyePlorer eyePlorer map for 'Chemical element': Atom Atomic nucleus Atomic number Chemical substance Proton Carbon Copper Gold Hydrogen Iron Nitrogen Oxygen Silver Isotope Promethium Technetium Bismuth Radioactive decay Nucleosynthesis Thorium Uranium Matter Nuclear reaction Classical element Nature Philosophy Chinese philosophy Phase (matter) State of matter Wu Xing Aether (classical element) Air (classical element) Ancient Greek philosophy Earth (classical element) Fire (classical element) Five elements (Japanese philosophy) Indian philosophy Japanese philosophy Mahābhūta Tattva Water (classical element) Plato Timaeus (dialogue) Cube Octahedron Regular polyhedron Tetrahedron Aristotle Empedocles Geber