What is the periodic law in chemistry?

Periodic law is one of the chemistry foundations. The law suggests that elements, when they are organized by atomic weight, tend to have similar properties at certain intervals apart. The credit for the formalization of the periodic law almost always goes to Russian chemist Dmitri Mendeleyev. In fact, the discovery was the result of an almost century of a frantic work of various scientists, all obsessed with the determination of properties and even discovering their own elements. The modern periodic table, the foundation in every school scientific room, is in fact a repeatedly refined and reorganized version of the original Mendeleyv chart.

During the 18th and 19th century, a new element seemed to appear every week. With advanced chemistry methods allowing better exploration of tiny substances, the persecution of elements has become an endless hunting of many of the greatest scientists of the day. With such an abundance of discovered elements and described, it soon became interested in many to organize elements in the list that had some rational sense.

Elements

are primarily described by several defining features: the number of protons in the core from which the atomic number is derived, weight calculations that define atomic weight and behavior. Many different attempts were made to arrange elements so that any of these factors would sort out in a reasonable way, but as a moving puzzle, every time one piece was in order, the others became disturbed. The periodic law, a theory that would align inconsistent information into the tidy table, seemed to be out of reach.

Although Mendeleyev correctly deserves recognition for a modern periodic table and pulling all the fibers that make up the periodic law was by no means the first to try. John Newlands, an English chemist, have seen tendentiacs that have similar behavior when ordered by atomic weight; Especially that every 8 intervals have appeared a mysterious similarity. His "Octave Theory" compared the elements to the keys to KA chest where every eight keys form a recurring set. The French scientist, Alexandre-Emile Béguyer de Chancourois, also recorded recurring properties and invented a table that arranged elements in the shape of a spiral. The work of both men was largely ignored by the scientific community and Newlands was often ridiculed for its comparison.

Mendeleyev at first glance illustrated the periodic law so that the elements horizontally lined with elements of atomic weight and vertically with similar properties. Alkaline metals of lithium, sodium, potassium, rubidium, caesseum and France thus create a proper line on the left side of the table, all that remains in order by the atomic weight. Since not all elements were discovered at the time of the table formation, Mendeleyev simply left the premises in the STEPODLE of his theories should fit in.

Periodic law provided insight into the organization system within chemistry that was previously suspicious. Mendeleyev by changing the organization of elements into a neat table using periodicRights, at first glance, made the elements shared by certain qualities. Although the table was later rebuilt and reorganized by British physicist John Moseley, the conclusions and theory of Mendeleyev remain unquestionable for more than a century after his death.