occurrence of oxygen

Magnesium sulphate occurs in nature as, Kieserite MgSO 4 .H 2 O Epsomite MgSO 4 .7H 2 O (in certain gypsum deposits). It is also present in certain mineral sprin..

Lithium occurs mainly as silicate minerals such as spodumene [LiAl(SiO 3 ) 2 ], lepidolite [(Li,Na,K) 2 Al 2 ,(SiO 3 ) 3 (F,OH) 2 ] etc. It is the 35 t h most abundant element by weight. Compounds of sodium and potassium have been know..

Large deposits of this salt occur in Owens lake in California and Lake Magadi in British East Africa. It occurs native as Na 2 CO 3 .NaHCO 3 .H 2 O in Egypt. During hot weather, soda is also collected from a large number of alkaline lak..

Astatine the last member of halogen family is a radioactive element with a very short life. All other halogens are abundant in nature in the combined state. The very high electronegativities of halogens make them very reactive and hence, they are not found in free state. In the combined state: i) F..

Occurrence and Uses - Aluminium is the third most abundant element (8.3% by weight) in the earth's crust after oxygen (45.5%) and silicon (25.7%). The important minerals of aluminium are: a) Bauxite, AlO x (OH) 3 - 2 x (0 < x <1) b) Cryolite, Na 3 AlF 6..

Aluminium is the third most abundant element (8.3% by weight) in the earth's crust after oxygen (45.5%) and silicon (25.7%..

Silicon is present in nature in the form of silica (SiO 2 ) and silicates. Rocks and clays consist of silicate minerals. Silicon is the second most abundant element (~ 27.2 wt%) on the earth's crust after oxygen {45.5wt%}. Germanium is a trace element (..

Minerals and Ores - Metals and their compounds are found in earth as natural elements known as minerals. Ores are minerals from which metals are extracted profitably and conveniently. Ores contain metal compounds with a lower percentage of impurities. All the ores are minerals, but all minerals are..

Sulphur occurs in the earth's crust to the extent of 0.05% mostly as metal sulphides and sulphates. It also occurs in the elemental form in large underground beds. Another major source of sulphur is H 2 S present in the natural gas and crude oil. Sulphur exists in combined state in ..

Occurrence of Elements in Nature - A large number of elements occur inside or around the earth. Less reactive elements, like platinum, gold, nitrogen, oxygen etc., occur in free (native) state. Chemically active elements always occur in the combined state i.e. in the form of com..