CIE iGCSE Co-Ordinated Science C2.7 Metallic bonding Exam Style Questions Paper 2

In a giant metallic lattice, the metal atoms lose their outer electrons to form positive ions (cations). These outer electrons become delocalised and form a ‘sea’ of free-moving electrons. The positive ions are fixed in position within the lattice and cannot move freely, while negative ions are not present in metallic structures. Therefore, only electrons are free to move.
✅ Answer: (D)