The green patina of Cu-alloy roofs results from corrosion
Chapter 23, Problem 23.26(choose chapter or problem)
The green patina of Cu-alloy roofs results from corrosion in the presence of O2, H2O, CO2, and sulfur compounds. The other members of Group 1B(11), Ag and Au, do not form a patina. Corrosion of Cu and Ag in the presence of sulfur compounds leads to a black tarnish, but Au does not tarnish. This pattern is different from that in Group 1A(1), where ease of oxidation increases down the group. Explain these different group patterns.
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