Tag: non-metals

Hydrogen, oxygen, nitrogen etc. are non-metal and boron, silicon, germanium etc. are metalloids. On the basis of chemical and physical properties, elements are further classified into metals, non metals and metalloids.

Aluminium is the most abundant metal in the earth's crust. The second most abundant metal in the earth is iron and third one is calcium.

Some metals are found in earth's crust in the free state. Some are found in the form of their compounds. The metals at the bottom of activity series are least reactive.

Iodine is a non-metal. Even though iodine is a non-metal, it has metallic lustre. It is neither ductile nor malleable. It is a poor conductor of electricity. These are properties of non-metals.

Boron is neither metal nor non metal it is a metalloid.

The oxide ore of zinc is known as zincite.

Metals found at the top of the reactivity series are never found in free-state as they are very reactive, e.g. K, Na, Ca, Mg and Al, etc.

Rubies are crystalline forms of aluminium oxide, which are red in colour due to the presence of chromium as an impurity. 

The carbonate and silicate ore of zinc is called as calamine and hemimorphite respectively.

 Carbonate ores are Magnesite $(MgCO _3)$, Dolomite $(CaCO _3MgCO _3)$, Calamine $(ZnCO _3)$, Malachite $(CuCO _3.Cu (OH) _2)$, Siderite $(FeCO _3)$, and Limestone $(CaCO _3)$.