It occurs naturally in many parts of the world as the mineral halite and as mixed evaporites in salt lakes. Sodium chloride in solution consists of a positively charged sodium ion and a negatively charged chloride ion. In solid form the atoms arrange themselves in a cubic crystal lattice. Table salt, when viewed under a magnifying glass, can be seen to consist of tiny cube flakes. The atomic weight of chlorine is 35.4527 and that of sodium is 22.989768.
Instructions Review the instructions below for each exercise.
Photocopy and distribute the Student Page . Distribute materials to each student group. Halite crystals can be ordered from a scientific supply company. Instruct them to record their observations of the compound. After students have recorded their observations, provide them with a large cubic halite crystal.