Dreams are able to change the reality, if they are to implement. Sometimes it is in them one finds the answers to their questions.
It even happens that a scientist dreams of becoming a new stage of evolution.
So it was with Mendeleev and his periodic law.
How it all began
Refuting an established history thatgreat discovery in the field of chemistry was just a nightmare, it must be said that many scientists before Mendeleev made attempts to create a chemical system. Fundamentals of her was laid by German scientist I. Dobereiner, Frenchman Antoine de Chancourtois and some others.
DI Sam Mendeleev spent an incredible amount of experiments and spent about twenty years of his life in search of truth. They were formed by the basic values and functions of the elements and their properties, only the information did not fit into something less structured. And when, after another sleepless night, he decided to rest for a couple of hours, the brain has issued what Mendeleev sought for so many years.
That is available in chemists in 1869 there was a periodic table, and only in 1871 was formulated by the law itself, which is allowed to go, not only chemistry, but also for many other sciences forward.
The essence of the law
Russian scientist Dmitri Ivanovich MendeleevIt was first made a startling discovery of the fact that the atom - is not an end unit that it has a nucleus and orbiting protons and neutrons, that the main mass of the atom is concentrated in its nucleus. Was derived properties tend to change in nature all the elements and their chemical compounds, depending on how the charge of atomic nuclei.
The increase in nuclear charge when it occursgoing from one table of the chemical elements to the second, which is located next door. It grows on one elementary charge charging unit, and this is reflected in the table below for each element designated as the atomic number. This means that the number of protons in the nucleus, is numerically equal to the number of electrons that a neutral atom, which corresponds to the core.
That outer shells composed ofelectrons, are determined properties of any chemical element. These membranes can be changed only occasionally, and these changes directly depend on the increase or on the decrease of the charge of the nucleus, located in the atom, and it is this, rather than atomic weight elements, is the basis of the periodic law.
Why is it so important
Due to the periodic law appearedthe ability to predict the behavior of certain chemical elements in various reactions. It was also determined that there are no open connections science. Only a century later, the table was full.