Now this is an effective way for co-curators to remember the names of elements… have the elements explode! Five out of the six Alkali metals react with air and water: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), and Caesium (Cs).
LITHIUM. Ea alkali metal has a specific, characteristic flame color, caused by diff in energy among valence shells...which corresponds to wavelengths of visible light. When added to flame, outer electrons r excited to higher-energy orbitals,which then relax back to lower-energy, emitting energy in light form. Diff light colors depend on how much energy or how far electron falls to a lower energy level. Alkali metals' bright flame colors make them useful in fireworks.