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.
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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.