Which group of the modern periodic table is NOT mentioned in Mendeleev's periodic table?

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APnictogen group

BChalcogen group

CHalogen group

DNoble gas group

Answer:

The group of elements that was missing from Mendeleev's periodic table was the Noble gases.
When the noble gases were discovered, they were eventually added to the periodic table as Group 18 (or Group 0 in older notations), and their placement did not disrupt the existing arrangement, which was a testament to the predictive power of Mendeleev's work.
He had even predicted the possibility of a new group of elements with unique properties.

Related Questions:

Select the incorrect statements from among the following.

(i) Newland arranged the elements in the order of increasing atomic masses and gave the law of Octaves.
(ii) Sodium is the eighth element after lithium.
iii) Calcium is the eighth element after Beryllium.
(iv) The law of Octaves was applicable only up to Magnesium, as after Magnesium every eighth element did not possess properties similar to that of the first.