Hydroxy compounds, Rules for calculating the oxidation numbers
The oxygenated acids ( acids contain oxygen ) and bases are considered as hydroxy compounds , They can be represented by the general formula ( MOH ) , where M is the element atom...
Category: Chemistry
Metallic & nonmetallic property , Acidic & basic property in the periodic table
At the beginning of the nineteenth century Berzelius was the first scientist who classified elements into two main group ( metals and nonmetals ) , according to their physical properties , Indeed that was...
Radius property, Ionization potential, Electron affinity & Electronegativity
The chemical properties & some of the physical properties of the elements depend on their electronic structure and especially on the valence electrons ( the electrons of the outermost level ) , The concept...
Modern periodic table and classification of Elements
The modern periodic table consists of 7 periods ( horizontal rows ) , 18 groups ( vertical columns ) , The elements are arranged ascendingly according to their atomic numbers and the way to...
The quantum numbers and principles of distributing electrons
Quantum numbers The mathematical solution of Schrodinger’s equation introduced four numbers that were called quantum numbers , to determine the energy of an electron in multi-electron atoms , we should know the four quantum...
Atomic emission spectra , Bohr’s atomic theory & Wave mechanical theory of the atom
On heating atoms of a pure elements – in gaseous or vapor state – to a high temperature or exposing them to a low pressure in an electrical discharge tube , they emit a...
