In Mendeleev's 1871 periodic desk, copper, silver, and gold are detailed two times, as soon as under group VIII (with the iron triad and platinum team metals), and once less than group IB. Group IB was Nevertheless parenthesised to notice that it had been tentative. Mendeleev's most important criterion for https://andreigbwp.liberty-blog.com/35973093/bigbos777-link-no-further-a-mystery