Question

Which group of elements was missing from Mandeleev's original periodic table?

Answer 1

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Group 18 was the group which was missing from Mendeleef's original Periodic table because the elements of this group did not react with other elements while forming a compound.

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Answer 2

Answer:

Noble Gases

The group missing from Mendeleev's periodic table was the Noble Gases (group 8A/18). Since these gases do not react very well, they are difficult to detect and were not known in Mendeleev's time.