Concept:Positive ions surrounded by mobile electrons describe metallic bonding.
Explanation:In metallic bonds, atoms release their outer electrons.
These electrons move freely, forming a "sea of electrons".
The remaining positive metal ions stay fixed in a lattice.
This electron sea binds the positive ions together strongly.
It also explains properties like conductivity and malleability.
This structure is not found in covalent, dative, or ionic bonds.
Answer:B. metallic bonds