A glance through complex intermetallic compounds of the alkali metals

M60 octahedra (see Fig. 4.28). The solid-state structure results from the packing of such groups. The inter-cluster distances are similar to those found in the metals. According to Simon, these compounds could be described as ([Rb902]5+, 5e ) and ([Csh03]5+, 5e ) with the five electrons donated to a conduction band, both inter-and intra-cluster metal-metal bonding, in agreement with the metallic conductivity of these compounds. 

In several cases, complex structural patterns such as, for instance, homo- and hetero-nuclear anions in Zintl phases are observed not only in the solid, but also in the liquid state. This can be related, for the liquid phase of several systems, to the 

4 ALLOYS OF THE ALKALINE EARTH METALS AND OF THE DIVALENT RARE EARTH METALS 

Calcium, Ca strontium, Sr barium, Ba radium, Ra europium, Eu ytterbium, Yb 

Calcium, strontium, barium and radium, the alkaline earth metals proper, are the typical elements of the 2nd column (the 2nd group) of the Periodic Table. 

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