iGCSE Chemistry 0620 Extended - 2.7 Metallic bonding- Exam Style Questions Paper 2- New Syllabus
▶️ Answer/Explanation
The diagram shows a lattice of positive ions surrounded by a sea of delocalized electrons — this is the characteristic structure of a metallic solid, or alternatively a giant ionic lattice. A structure with a regular arrangement of positive and negative ions alternating represents an ionic compound. A giant covalent structure (like diamond) shows atoms bonded by shared electron pairs with no free electrons. Based on the structure shown, the diagram represents solids that possess this giant lattice arrangement with free/delocalized electrons.
✅ Answer: (B)
✅ Answer: (B)
▶️ Answer/Explanation
Correct Answer: A
Explanation: In metallic bonding, the positive metal ions (cations) are arranged in a giant lattice surrounded by a ‘sea’ of delocalised electrons. These delocalised electrons are free to move throughout the structure, allowing them to carry an electric current.
✅ Magnesium has delocalised electrons that can move through the lattice.
▶️ Answer/Explanation
Cobalt is a transition metal. Metals have a giant structure consisting of positive metal ions arranged in a lattice, surrounded by a ‘sea’ of delocalised electrons. This is called metallic bonding.
✅ Answer: (C)
✅ Answer: (C)