1. A solid is a state of matter characterized by a fixed shape and volume, where the particles (atoms or molecules) are closely packed together in a structured arrangement.
2. There is an electron and proton, that forms a hydrogen atom. In that part I only see the charge is visible.
3. Two hydrogen atoms are separated by a wall.
4. When two hydrogen atoms interact and bond together, they form a hydrogen molecule, denoted as H₂.
5. -2
6. positive 0