Carmel-by-the-Sea's New Food Packaging Requirements Council Discretionary Funds Grant Application Packet
Introduction. The term heavy metal refers to any metallic chemical element that has a relatively high density and is toxic or poisonous at low concentrations. Examples of heavy metals include mercury (Hg), cadmium (Cd), arsenic (As), chromium (Cr), thallium (Tl), and lead (Pb).
Cadmium chloride forms crystals with rhombohedral symmetry. Cadmium iodide, CdI 2, has a very similar crystal structure to CdCl 2. The individual layers in the two structures are identical, but in CdCl 2 the chloride ions are arranged in a CCP lattice, whereas in CdI 2 the iodide ions are arranged in an HCP lattice.