MCQ : At the time of Publication of Mendeleevs periodic table the number of inert gas elements discovered are

Question

At the time of Publication of Mendeleev’s periodic table the number of inert gas elements discovered are –

1. 1
2. 3
3. 3
4. 0

Answer

(d) 0

Explanation : 

At the time of publication of Mendeleev’s periodic table, no inert gases had been discovered yet. The discovery of the first noble gas, helium, did not occur until 1895, two years after the publication of Mendeleev’s periodic table.