Question

The Mendeleev's periodic table, Ar and ________ form the anomalous pair.

Answer 1

Mendeleev's Periodic Law -

• The properties of the elements are a periodic function of their atomic weights.
• In Mendeleev's periodic table, noble gases like Ar are placed in the zeroth group while alkali elements like K are in the first group.
• Hence, Ar, and K form anomalous pairs.