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Radio It is a notion with a lot of meanings according to the context. It can be about segment that links the circumference of a circle with its center, of a bone of the human body, of Thunderbolt of some wheel, of apparatus that captures radio waves and transforms them into sound or from a chemical element .

Atomic , on the other hand, is the adjective that qualifies what is linked to a atom (the smallest amount of a chemical element that is indivisible and that has its own existence).

That said, we can get into the concept of atomic radio . This notion refers to half of the distance that exists in the cores of two atoms that are adjacent and that are linked by a covalent bond, or at the distance between the outermost orbital of one and the nucleus of another.

The concept of atomic orbital is defined as a particular solution determined, independent of time and space, to the Schrödinger equation for an electron that undergoes a coulombian potential . Let's look at the three complementary concepts of this paragraph in more detail:

* the particular or complete solution is a case of the partial derivation equation (EDP) that has the same number of independent variables as arbitrary constants. EDP, meanwhile, is called the equation that has as unknowns functions of different variables, with the particularity of including in the equation those derived from these functions;

* Schrödinger's equation was created by an Austrian physicist of the same name in the early twentieth century and serves to describe the evolution in the weather of a massive non-relativistic particle. In quantum mechanics, where it has a fundamental role, it allows to associate microscopic particles with Second law of Newton, also known as the Fundamental Law of Dynamics, which defines that the variation of movement occurs in proportion to the driving force that is printed and in accordance with the straight line on which said force is oriented;

* Coulomb's potential is part of the homonymous law, which, among other things, proportionally relates the forces electric two charges with the product of the magnitude of these charges. Coulomb's potential is a scalar function that is applied to facilitate the use of vector expressions in which electrical charges and force fields are involved.

Through the atomic radius, you can calculate the size of the atom in question; the size of atoms, on the other hand, affects the changes of state , density and others properties , such as the melting point and the boiling point.

The attraction force which the nucleus exerts on the electrons determines the atomic radius. As the effective load increases, the bond between the nucleus and the atoms becomes stronger and, therefore, the atomic radius becomes smaller. Conversely, when the load decreases, the atomic radius increases.

If we observe the periodic table , we will notice that the elements have greater atomic radius as we move down and to the left. This is because the atomic radius increases when a period , while decreasing if one advances group .

It is important to highlight that it is possible to distinguish between atomic radius covalent (when the cores are at a distance is equivalent to the result of adding its covalent radii) and metal (when the atomic radius represents half of the segment that can be drawn between each nucleus in metallic crystals). Despite this classification, the first case is the one that is used most frequently.

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