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.
Chromium is a chemical element. Its symbol on the periodic table (a list of all the elements) is Cr. Its atomic number is 24. (The atomic number says where chromium sits in the periodic table.)Its mass number (number of protons and neutrons) is approximately 54. It always has 24 protons. Most of the times it has 28 neutrons, but sometimes different isotopes have more or less neutrons. As a metal, it has 24 electrons.