Francio
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El francio es un metal alcalino raro con el número atómico 87 que se encuentra en la corteza terrestre. Todos sus isótopos son inestables y posee el equivalente químico más elevado de todos los elementos.
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Francio
- 1. Francio Elemento químico de núm. atóm. 87. Metal alcalino raro en la corteza terrestre, posee el equivalente químico más elevado de todos los elementos y todos sus isotopos son inestables. (Símb. Fr). REGRESAR