Chemical elements found in nature mostly not as individual atoms, but as complex or simple substances. Only the noble gases - helium, neon, argon, krypton and kseon - are in the nature of the atomic state, which explains the stability of the electron shells of atoms of the noble gases. In all other simple and complex substances atoms linked by chemical forces. There are several types of chemical bonds, the most important of them - covalent, ionic and metallic. In general, the chemical bond is formed, if the total energy of the system consisting of a one-to-active atoms with atoms approach decreases. Using the concept of electronegativity of elements, we can anticipate the main three cases of chemical interaction between the atoms: If you get more information, visit our site: BEST ESSAY CHEAP
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