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In Mendeleev's 1871 periodic table, copper, silver, and gold are shown twice, after below team VIII (While using the iron triad and platinum team metals), and the moment underneath group IB. Group IB was nonetheless parenthesised to notice that it had been tentative. Mendeleev's key criterion for group assignment was https://bigbos777-judi-slot61368.theobloggers.com/profile

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