In our daily life we come across processes like rusting of iron articles, fading of the colour of the clothes, […]
PERIODIC TRENDS IN PHYSICAL PROPERTIES Most of the properties of the elements such as atomic volume, atomic size, ionization enthalpy, electron […]
Categories
Periodicity
PERIODICITY THE NEED FOR CLASSIFICATION OF ELEMENTS https://www.youtube.com/embed/P6DMEgE8CK8Before the beginning of eighteenth century, only a very few elements were known […]
Categories
compounds of sulphur with hydrogen
Hydrosulphuric acid (H2S). This substance is a gas having the composition expressed by the formula H2S and is commonly called hydrogen […]
Categories
Suphur and it’s compound
Sulfur belongs to the chalcogen family. Other members of the family are oxygen, selenium, tellurium, and polonium. These elements make up Group 16 (VIA) […]
Categories
Compounds of Nitrogen
Nitrogen has 5 electrons in its valence shell. It has a valency of 3 with respect to hydrogen and a […]
Categories
Nitrogen and it’s properties
Nitrogen, which makes up about 78% of our atmosphere, is a colorless, odorless, tasteless and chemically unreactive gas at room […]
Categories
The Halogens
There are six elements in Group VIIA, the next-to-last column of the periodic table. As expected, these elements have certain […]
Categories
Oxygen and it’s compound
Oxygen is the most abundant element on earth. It is found almost in everything in nature and also in free […]
Categories
History of hydrogen
Hydrogen comes from Greek meaning “water producer” (“hydro” =water and “gennao”=to make). First isolated and identified as an element by Cavendish […]