Which metal should be used while constructing roof for a metal building??
Metals have some basic properties... Scratch the substance with a knife of something like that...If the surface below is lustrous or shiny then it is a metal...Also, metals can be made into wires and sheets...You can make wires and sheets out of iron, copper, gold and aluminium....Can u make a wire or sheet with helium or sulphur..As far as i know...NO! bcoz sulphur is powdery and helium is a gas... Wats more when u scratch iron, aluminium, copper and gold they will reveal a lustrous surface beneath...But u cnt scratch sulphur or helium... Easy!!! isn't it??
Iron is magnetic, and shiny. and it conducts electricity and heat, and its heavy ( close fit molecular structure) Copper conducts electricity and heat (not magnetic though) Helium does not conduct electricity , and ist a gas (you would have to make it VERY cold, to make it even liquid) Sulfur does not conduct electricity and not much heat, it has a low density ( loose molecular structure) Gold conducts electricity and heat (not magnetic either). It wont rust (or oxidize). Aluminium conducts electricity and heat. ( not magnetic)
A metal has great ability to produce cations. A non-metal has not such hability and will better give anions.
1) Copper conducts electricity so its a metal and it is ductile (it can be drawn into wires) 2) Helium has a very low boiling point (hence why it is a gas at room temperature)so its not a metal 3) Sulphur is not a metal as it can't conduct electricity or heat 4) Gold is a metal as it is easily malleable (1 cm^3 of gold can be hammered into a circle foil of 5m) 5) Aluminium is a metal as it is shiny When saying why something is a metal, look at their general properties: Metals are: - Malleable - Ductile - Shiny when cut - Sonourous (ringing sound when striken) - Usually of high density - Conduct electricity and heat - Usually have a high melting point (except alkali metals and mercury and a few others) So when you look for a non-metal, compare against the properties that make a metal. I hope this helps!
