What are metal ions and metallic bonding? (Easy explanation)
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Metallic bonding is the strong attraction between closely packed positive metal ions and a 'sea' of delocalised electrons.
The attraction between the metal ions and the delocalised electrons must be overcome to melt or to boil a metal. Some of the attractions must be overcome to melt a metal and all of them must be overcome to boil it. These attractive forces are strong, so metals have high melting and boiling points.
This is from BBC Bitesize, and I don't understand what the diagram means.