1. What will happen if ionic compound's ions not stick together? Will ion not stick together in molten form?
2. 有冇substance 是絕對不導電? Non-metal 是否有些是少許導電?
3. Cl2 means element of Chlorine or 1 Chlorine molecule?
4. Cl can be Chlorine's element symbol, 但又有Cl2, 分別幾時用?