which group of element was missing from Mendeleev's orginal periodic table?
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It was later identified as gallium. Gallium, germanium, and scandium were all unknown in 1871, but Mendeleev left spaces for each and predicted their atomic masses and other chemical properties. Within 15 years, the “missing” elements were discovered, conforming to the basic characteristics Mendeleev had recorded.
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18th group of elements was missing from Mendeleev's original periodic table because they were not known at that time and they are virtually imperceptible due to the fact that they won't react with any other element.
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