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  1. TEXTX !6d½Text1ArticleText1Heading#4ElementGoToArticleArticle<TABLE><TR><TD><P_EH>Símbolo químico</P_EH></TD><TD><P_ED>Cs</P_ED></TD></TR><TR><TD><P_EH>Tipo</P_EH></TD><TD><P_ED>Metal alcalino</P_ED></TD></TR><TR><TD><P_EH>Número atómico</P_EH></TD><TD><P_ED>55</P_ED></TD></TR><TR><TD><P_EH>Grupo de la tabla periódica</P_EH></TD><TD><P_ED>1</P_ED></TD></TR><TR><TD><P_EH>Masa atómica relativa</P_EH></TD><TD><P_ED>132,91</P_ED></TD></TR><TR><TD><P_EH>Densidad</P_EH></TD><TD><P_ED>1,88 g cm<SUP>-3</SUP></P_ED></TD></TR><TR><TD><P_EH>Punto de fusión</P_EH></TD><TD><P_ED>28,4∘C</P_ED></TD></TR><TR><TD><P_EH>Punto de ebullición</P_EH></TD><TD><P_ED>678∘C</P_ED></TD></TR><TR><TD><P_EH>Descubrimiento</P_EH></TD><TD><P_ED>En 1860 por R. Bunsen y Gustav Kirchoff </P_ED></TD></TR><TR><TD><P_EH>Origen del nombre</P_EH></TD><TD><P_ED>Del latín <I>caesius</I>, azul grisáceo;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               las líneas del espectro son azules</P_ED></TD></TR></TABLE><TITLE>Cesio</TITLE><ENHP><HOT TARGET=140>Metales alcalinos</HOT></ENHP>