1. Show the class pictures of five very different mammals, such as a cat, kangaroo, horse, rabbit, and monkey. Explain that all these animals are mammals, and that mammals constitute one class of the animal kingdom, which also includes other classes, such as reptiles, birds, and fish. Ask students what these five mammals have in common and mark their responses on a sheet of chart paper.
When ionic compounds are in a molten state or dissolved in water, forming an aqueous solution, the ions that formed the ionic compounds are able to move around freely, thus able to conduct electricity.
The characteristics are: 1) High melting point and boiling point; . Strong electrostatic force of attraction between the oppositely charged ions, hence, a large amount of energy is required to break them. 2 Ionic compound do not conduct electricity in the solid state.