Krypton silver metal

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Gold, silver, and platinum are members of a class of metals called noble metals because they are relatively unreactive. (The term noble implies a class set apart.) Other elements that appear in nature in the uncombined state are the elements in Group 8 helium, neon, argon, krypton, xenon, and radon. 

Only a few elements occur free in nature. The noble gases—helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn)—occur in air as separate atoms. In addition to occurring in compounds, oxygen (O), nitrogen (N), and sulfur (S) occur in their most common elemental form as the molecules O2, N2, and Sg, and carbon (C) occurs in vast, nearly pure deposits of coal. And some metals—copper (Cu), silver (Ag), gold (Au), and platinum (Pt)—are also sometimes found uncombined. But, aside from these few exceptions, the overwhelming majority of elements occur in compounds, combined with other elements. 

In Figure 12.5, we show the band structure for two electronically very different metals aluminum (Al) and silver (Ag). The electronic configuration for Ag is [Kr]5i4(j ° showing that it has 11 electrons outside a krypton-like closed shell. 

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