Answer: C (2 and 3). Statement 1 is false: metals are malleable. Layers of metal cations can slide over one another when a force is applied, while the sea of delocalised electrons keeps the lattice held together.
Statement 2 is true: metals are good conductors of thermal energy, because the mobile delocalised (‘sea’) electrons transfer kinetic energy quickly through the structure.
Statement 3 is true: metallic bonding is described as a regular lattice of positive ions surrounded by a ‘sea’ of delocalised electrons.
So statements 2 and 3 are correct.
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