Dmitri Mendeleev was unable to assign the correct position to which element?
Show answer & explanation
Correct answer: B
Explanation
Correct Answer: Option 2 (Hydrogen)
Explanation:
Dmitri Mendeleev was unable to assign a correct position to hydrogen in his periodic table because its properties resemble both alkali metals (Group 1) and halogens (Group 17). This made it difficult to determine its precise position.
Additional Facts:
Hydrogen is the lightest element and has an atomic number of 1.
It can exhibit both +1 and -1 oxidation states.
Even in the modern periodic table, hydrogen's position is considered somewhat unique.
Possible Questions for the Upcoming Exam:
On what basis was Mendeleev's periodic table created?
(Answer: Atomic mass)
What is the atomic number of hydrogen?
(Answer: 1)
Which groups does hydrogen belong to?
(Answer: Alkali metals and halogens)