KnowraPeriodic tableLinked fromLinked fromThe 189 pages that link to Periodic table, each with the reason it gives.All 189Broader topic 2Related 63Narrower topic 121Compared with 3Periodic table extensionCompared with: The confirmed table ends where experimental evidence stops; proposed extensions go beyond that boundary.Four elementsCompared with: Its measured elements displaced the classical substances as chemistry’s basic material kinds.UnhexenniumCompared with: The established table ends at confirmed elements; element 169 lies in a speculative extension.