Periodic table
All 118 elements. The 30 marked with a dot are the ones a rebuilding civilization makes or has to handle: choose one to see where it comes from, how it is obtained, from which tier of the ladder, and how it harms.
Alkali metalAlkaline earth metalTransition metalPost-transition metalMetalloidNonmetalHalogenNoble gasLanthanideActinide•Made or used on the ladder
The elements on the ladder, by the tier that first makes them
PubChem Periodic Table of Elements, US National Library of Medicine (public domain). Masses as PubChem publishes them; temperatures converted from kelvin. PubChem periodic table ↗ · IUPAC periodic table ↗