The classification of metals according to their chemical activity
The metals and chemical activity
Very active metals
Very active metals are metals which react with oxygen as soon as being exposed to humid air , so they lose their metallic luster such as sodium and potassium , Sodium and potassium are kept under kerosene surface to prevent their reaction with the atmospheric oxygen .
Less active metals
Less active metals are the metals which react with oxygen if they left in the air for some days and a layer of rust is formed such as iron , aluminum and copper .
Steel bridges and the holders of light bulbs are painted from time to time to protect them from rust and corrosion .
Metallic spare parts of cars are covered with grease to protect them from rust and corrosion , Washing of cooking pans are made of aluminum with a rough material to remove any layer formed on them .
Inactive metals are metals which find great difficulty to react with oxygen such as silver , platinum , nickel , gold and chromium .
Silver and gold are used in making jewels because silver and gold are chemically poor active .
Nickel , gold and silver are used to cover other substances which rapidly gain rust to protect them from the corrosion .