the solid state
1. Both metallic and ionic crystal has strong attraction force between the atom or ions.
2. Both of them conduct electricity.
3. Both are solid and hard.
1. Metallic crystals conduct electricity in all three state of matter while ionic crystal conduct electricity only in molten state.
2. In metallic crystals, there is a strong electrostatics bond between electrons and positively charged ions while in ionic crystals , there is a strong ionic bond between anion and cations.
Solution B: They are brittle because ionic bond is non-directional. So when they are hammered they got brittle.