النتائج (
الإنجليزية) 2:
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The most important technical terms:
Corn is a set of objects finite precision. These objects consist of a positively charged nucleus and often contain protons and neutrons, and there are also a number of electrons which are equivalent to the positive charge in the nucleus. And spin of electrons at different levels of known energy levels, which holds the first level only two electrons and holds a second level eight electrons. The third level is 18 electron carries. Each power level sub - levels symbolized by the symbols s, p, d, f. Often the atoms are neutral electrically because the number of negative electrons equal to the number of protons positive, the atom can be transformed into a positive ion when you lose several electrons or more when the chemical reaction can also be transformed into a negative ion when gaining an electron or more, depending on the value of the cargo being lost or gained .
Element is a class of atoms that have the same number of protons in the nucleus. This number is called the atomic number of the element. For example, all of the atoms that have six protons in the nucleus are atoms of a chemical element called carbon, and all atoms have 92 protons in the nucleus of uranium atoms are an item. Better distribution and shape of the elements generally found in the periodic table, which is placed with similar chemical characteristics of the elements in the same group. As the item is described in his name, symbol, atomic number is . The chemical compound is a substance composed of a certain percentage of the elements which define the installation of the boat and the group in which this compound is located and which thus determine the properties of this compound. For example, water is a compound containing hydrogen and oxygen by 2 to 1. vehicles composed and transformed by chemical reactions. Stray (ions) is a compound charged, or is an atom or molecule that has gained or lost one or more electrons. Cation charge called (cations) such as sodium cation NaNa + and negatively charged ions are called (anion) like (anion) chlorine Cl-, and two when their union be neutral salt sodium chloride (NaCl). And like many of the ions with atoms that do not disintegrate during the interactions of DNA - the base is the hydroxide group (OH-), or phosphate (PO43-). Chemical bonds.
Chemical bond is the force that binds the atoms in the molecule or crystal. In many simple compounds, valence and the principle of oxidation number theory can be used to predict molecular composition. Similarly, the theories of classical physics can be used to predict the installation of many ionic compounds. The compounds with complex structure, such as metal alloys, the parity theory can not explain installed, and here show the importance of using the theories of quantum mechanics , such as molecular orbital theory. Some types of chemical bonds: the Association of ionic bond covalent bond metal and dipolar bond of harmonizing Association glided under the covalent bond and almost no other association , a hydrogen bond and has a great role in life on Earth.
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