Which statement describes what happens to the outer electrons when iron atoms form metallic bonds?
They stay attached to their own iron atoms in fixed positions.
They become delocalised and move throughout the metal structure.
They are transferred to neighbouring iron atoms, forming positive and negative ions.
They are gained by each iron atom to fill its outer shell.
122 exam-style questions on OCR GCSE Chemistry 2.2 Bonding, covering 2.2.1 Metals, non-metals and the Periodic Table, 2.2.2 Types of chemical bonding and dot and cross diagrams, 2.2.3 Limitations of bonding models, and 2.2.4 Reactivity, atomic number and the modern Periodic Table. Each one has a worked solution and a mark scheme showing where the marks go.