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

Answer:

2️⃣ Hydrogen

is the answer for this question

Answer 2

Answer:

2) HYDROGEN is the right answer