This reference groups the periodic table into its families — alkali metals, halogens, noble gases and more — each with shared chemical properties.
| Group | Family | Examples |
|---|---|---|
| Group 1 | Alkali metals | Li, Na, K, Rb, Cs — soft, very reactive |
| Group 2 | Alkaline earth metals | Be, Mg, Ca, Sr, Ba |
| Groups 3–12 | Transition metals | Fe, Cu, Ag, Au, Zn |
| Group 17 | Halogens | F, Cl, Br, I — reactive non-metals |
| Group 18 | Noble gases | He, Ne, Ar, Kr — inert |
| Lanthanides | Rare earth metals | La–Lu (57–71) |
| Actinides | Radioactive metals | Ac–Lr (89–103) |
| — | Metalloids | B, Si, Ge, As — metal/non-metal mix |