Question

*The major demerit of Mendeleev's periodic table is that the element _______ could not be properly positioned.*

1️⃣ Helium
2️⃣ Hydrogen
3️⃣ Alluminium
4️⃣ Chlorine​

Answer 1

option 2

hydrogen

The major demerit of Mendeleev's periodic table is that the element hydrogen could not be properly positioned.

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Answer 2

Answer: hydrogen is the answer

Explanation:

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