Chancourtois (1820-1886), English chemist, arranged the elements as follows: initially divided the

Download
A problem for chemists was to build a consistent theory to explain how electrons are distributed around nachos toppings the atoms, nachos toppings giving them the characteristics of reaction observed at the macroscopic level.
Linus Pauling G. (1901-1994), American chemist, produced a handy device that lets you put all the energy sublevels known in order of increasing energy. It is the process of diagonals, called Pauling diagram. The order of increasing energy sublevels is the order of the sequence of diagonals.
The electrons are distributed in layers around the nucleus of the atom. It is assumed that there are 7 electronic layers, designated by the uppercase letters, K, L, M, N, O, P and Q. As the layers move away from the core, increases the energy of electrons located therein.
Historical Evolution of the Periodic Table Structure
Chancourtois (1820-1886), English chemist, arranged the elements as follows: initially divided the surface of a cylinder in 16 columns nachos toppings and numerous horizontal; attributed to oxygen mass 16u; drew a helix which began by oxygen (0 point) and ended in the sixteenth nachos toppings heaviest element, to where the line reached. Repeated this procedure until all elements were allocated to the dividing lines.
John AR Newlands (1838-1898), professor of industrial chemistry and English, nachos toppings devised the classification of the elements in ascending order of atomic mass in groups of seven and placed side by side. Soon realized that the chemical properties were similar to the first and eighth elements - from left to right - like musical notes that repeat every octave.
Law of Octaves This model was also banned for present problems, again, with the values of the atomic masses. That is, some elements were in the wrong places: fluorine and chlorine, for example, do not have similar cobalt or nickel characteristics.
We must expect the discovery nachos toppings of many yet unknown elements; for example, similar to aluminum (eka-aluminum) and silicon nachos toppings (exa-Silicon) elements, whose atomic weight would be between 65 and 75 "
Henry Moseley GL, established the true identity of an element is not directly related to the mass of it, but with the nuclear charge of the atom that is. Thus, slightly modified the proposal by Mendeleev table, remaining essence until today.
electronic distribution and periodic table
periodic table and properties
The text of the ninth edition of the book Basic Engineering Circuit Analysis has a ...
Stay connected: Facebook Twitter Google+ Orkut