Saved Bookmarks
| 1. |
*The major demerit of Mendeleev's periodic table is that the element _______ could not be properly positioned.*1️⃣ Helium2️⃣ Hydrogen3️⃣ Alluminium4️⃣ Chlorine |
Answer» 2️⃣ Hydrogenis the answer for this QUESTION |
|