Chapter 12 The alkali and alkaline earth meta X 12.1 The elementary substances 12.2 The properties of the alkali and alkaline earth compounds X$12.3 The particularity of Li and Be The diagonal relationship§12.3 The particularity of Li and Be The diagonal relationship §12.2 The properties of the alkali and alkaline earth compounds §12.1 The elementary substances Chapter 12 The alkali and alkaline earth metal