In Mendeleev's 1871 periodic desk, copper, silver, and gold are stated two times, after under team VIII (with the iron triad and platinum group metals), and after below group IB. Team IB was However parenthesised to note that it had been tentative. Mendeleev's main criterion for team assignment was the https://bigbos777link34444.answerblogs.com/36139674/bigbos777-an-overview