Dual coding theory has been applied to many cognitive phenomena including: mnemonics, problem-solving, concept learning and language. Dual coding theory accounts for the significance of spatial abilities in theories of intelligence (e.g., Guilford).
Properties. 1  Atomic Symbol: Cr. 2  Atomic Number: 24. 3  Atomic Mass: 51.996g/mol1.  Element Category: Transition 1  Metal. Density: 7.19g/cm3 at 20Â° C. Melting Point: 3465Â°F 1  (1907Â°C) Boiling Point: 4840Â°F (2671Â° C) Mohâs Hardness: 5.5.
The only binary compound is the volatile chromium(V) fluoride (CrF5). This red solid has a melting point of 30 Â°C and a boiling point of 117 Â°C. It can be prepared by treating chromium metal with fluorine at 400 Â°C and 200 bar pressure. The peroxochromate(V) is another example of the +5 oxidation state.