Wikipedia:WikiProject Elements/PTG/categories/2020

Periodic table

Summary of changes from 2018

 * Restore "halogen" (X) and "other nonmetal" (ONONM) categories from 2010 version
 * "Unknown chemical properties" is now used only for predicted elements (E119 and up)
 * Group 12 elements are classified as TM
 * AM color lightened
 * Categories removed (name or class): Unknown, Post-Transisiton metal, Reactive nonmetal.
 * New category (name or class): Other metal, Other Nonmetal, Halogen


 * Reordering Category scheme (Nov 2020)
 * Rationale
 * 

Contrasts





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Hex neighborhood



 * 10 colors, no Unk, 2 repetitions

Issues

 * No categories except ONONM, HAL, & NG meet AAA
 * AM and AN do not meet AA
 * PTM/MOID are too similar
 * SoM should have other distinguishers in addition to, or instead of, color.