what is the meaning of -"in metallic solids , positive ions are surrounded and are held together in a sea of delocalised electrons" ?

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Solution

This phenomenon is known as the electronic sea model of metallic solids. In metallic solids, the positively charged nuclei are held together by valence electrons. Electrons usually are not bound to any particular atom making them delocalised. Now, if we visualise the whole setup, it feels like the positively charged nuclei are flowing inside a sea of delocalised electrons.

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