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.
Updated February 19, 2017. Gallium is a shiny metal with one property in particular that makes it perfect for science tricks. This element melts just above room temperature (around 30Â°C or 86Â°F), so you can melt it in the palm of your hand, between your fingers, or in a cup of hot water. A classic set-up for gallium tricks is to make or purchase a spoon made from pure gallium.