In Mendeleev's 1871 periodic table, copper, silver, and gold are shown twice, after beneath group VIII (Along with the iron triad and platinum group metals), and when below group IB. Group IB was Even so parenthesised to notice that it had been tentative. Mendeleev's primary criterion for team assignment was https://situsbigbos77769146.ourcodeblog.com/36051279/the-best-side-of-bigbos777-link-slot