Question

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

• A. Pnictogen group
• B. Chalcogen group
• C. Halogen group
• D. Noble gas group

Answer 1

Answer:

D. Noble gas group

• 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.