5. Elements of group 14
Properties and trends
METALS AND METALLOIDS OF GROUP 14
PHYSICAL PROPERTIES
Along this group, there is a clear distinction in the physical properties between the nonmetal, carbon, and the two semimetals, silicon and germanium; all three with high melting and boiling points, showing the network covalent bonding. Contrarily, the two metals in the group tin and lead present lower temperatures and long liquid ranges (Table 5.1), a common feature in all metals. Another key point in the Group 14 elements is that the tendency of catenation (forming chains of atoms with themselves), decreases down the group as the atomic and ionic radius increases. Another important characteristic of these elements is that they show allotropy, that is, they can occur in two or more forms which present different arrangements of the element which implies having different physical properties, although they have similar chemical properties.
CHEMICAL PROPERTIES OF ELEMENTS FROM GROUP 14
Francisco Javier Cervigon Ruckauer
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