Chemistry
Metals vs Nonmetals
Sea of free electrons makes metals shiny, bendy, conducting. Nonmetals lock theirs up.
Tap a metal spoon — CLANG. Tap a glass cup — CLINK, careful it shatters. Why are metals SO different from glass, plastic, and wood? They all share secrets.
Concepts you just met
ConductivityMalleabilitySea of ElectronsSemiconductors