Wikipedia:WikiProject Elements/PTG/categories/2021a

Periodic table legend

Element color 2021a

 * Alkali metals → ?
 * Alkaline earth metals → ?
 * Lanthanides → ?
 * Actinide → ?
 * Transition metal → ?
 * Post-transition metal → ?
 * Metalloid → ?
 * Other nonmetal → ?
 * Halogen → ?
 * Noble gas → ?
 * Unknown chemical properties → ?


 * SoM


 * solid → ?
 * liquid → ?
 * gas → ?
 * phase unknown → ?

Analysis & issues

 * todo