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Los metales alcalinosLos metales alcalinos corresponden al Grupo 1 de la Tabla Periódica (anteriormente grupo I A). Átomo de litio. Estos metales son: Litio (Li), sodio (Na), potasio (K), rubidio (Rb), cesio (Cs) y francio (Fr). Constituyen el 4,8 por ciento de la corteza terrestre, incluyendo capa acuosa y atmósfera.

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