Ionic compounds have high melting and boiling points because a substantial amount of energy is required to break the strong inter-ionic attractions present in their crystal lattice structure.

Ionic compounds are hard and brittle due to the strong force of attraction between the positive and negative ions, leading to the formation of a rigid crystalline structure.

Iron filings burn vigorously due to their fine particle size, enhancing reactivity with oxygen. Copper, when heated, does not burn, but it forms a black-colored layer of copper(II) oxide on its surface.