107 Stories About Chemistry
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But wait! There is already an eighth group, "built into" the table by Mendeleyev himself. This group contains nine elements: iron, cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium, and platinum. What is to be done about it? In other words, chemists have come up against another inconsistency. The familiar appearance of the Periodic Table must be changed, and that very soon. "There is always something in the way" runs the proverb. What is in the way of this change in appearance is the "old" eighth group. Where is it to be placed?
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