Properties and Classification of Metals

Metals have various properties,, and these properties determine their usefulness.. Their main properties are as follows.:

• State: Solid at room temperature, Crystalline/ Exceptions:: Hg(1types)
• Workability: High ductility, and malleability
• Reflectivity: Ability to reflect light
• Conductivity: Good conductors of heat, and electricity
• Specific gravity,, hardness,, and melting point: are high.

These properties make metals useful in construction,, electronics,, automobiles, and many other fields..

Metals are classified according to specific gravity.. Specific gravity 4.5provides the boundary between two classifications.:

• Light metals: Al(2.7), Mg(1.74), Na(0.97), Si(2.33), Li(0.53) and similar elements
• Heavy metals: Fe(7.87), Cu(8.96), Ni(8.85), Au(19.32), Ag(10.5), Sn(7.3), Pb(11.34), Ir(22.5) and similar elements

Poisson's ratios and recrystallization temperatures of metals are as follows.:

• Poisson's ratio: Rubber(0.5), Lead(0.43, (Maximum)), Iron(0.28), Cork(0)
• Recrystallization temperature: W, Ni, Pt, Fe, Cu, Ag, Al, Mg, Zn, Su, Pb Pure