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Indicator. Explaining the tendency of an element to stable. Writing the arrangement of valence electron of noble gas (duplet and octet) and the valence of electron of non noble gas.

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  1. Indicator Explaining the tendency of an element to stable Writing the arrangement of valence electron of noble gas (duplet and octet) and the valence of electron of non noble gas by SeLly in Sept 2008, PTK

  2. Among of the all elements in this nature, only group VIIIA (noble gas) elements representing the most stable elements (difficult to form compound). Therefore, the noble gas elements generally stay in the form of free atoms (monoatomic gases) The stability of the noble gas elements caused by the noble gases atoms have the unique electron configuration by SeLly in Sept 2008, PTK

  3. The electron configuration of noble gas elements He = 2 Ne = 2 8 Ar = 2 8 8 Kr = 2 8 18 8 Xe = 2 8 18 18 8 Rn = 2 8 18 32 18 8 by SeLly in Sept 2008, PTK

  4. Generally, the electron configuration of noble gas elements have 8 valence electrons (octet configuration), except helium element having 2 valence electrons (duplet configuration) Cause of that, the noble gas elements difficult to react and represent the most stable elements among other elements by SeLly in Sept 2008, PTK

  5. So, every element have tendency to reach the stability by form a bond with another element The elements that don’t have a noble gas configuration, tend to attain such a configuration through a certain chemical reaction. Stable molecules are form when the atoms combine so as to have 8 electrons in outer shells (form octet configuration) Lewis-Kossel’s octet principle by SeLly in Sept 2008, PTK

  6. Lewis Symbol Writing method of valence electron configuration of the bonded atoms using a sign Lewis symbol made by writing down symbol of the atom and encircle by dots or lines or crosses or stars expressing the number of valence electron of the atom. by SeLly in Sept 2008, PTK

  7. Mg Al H C N O Ne F Group IA Group IIA Group IIIA Group IVA Group VA Group VIA Group VIIA Group VIIIA by SeLly in Sept 2008, PTK

  8. Now, you can try to draw the Lewis symbol of : 5B 3Li 15P 2Be 14Si 16S 18Ar 35Br by SeLly in Sept 2008, PTK

  9. Electropositive element The electron configuration of atom with tendency to release the electron The elements which have a little of valence electron, such as group IA (except H atom), IIA and IIIA have tendency follow the octet principle That elements release the valence electron to form positive ion The charge values according to valence electron of atoms Atoms which have tendency to release the electrons that have a little relative of ionization energy The metal elements

  10. Forming the positive ions of some elements by SeLly in Sept 2008, PTK

  11. The electron configuration of atom with tendency to accept the electron The elements which have many valence electron such as group IVA, VA, VIA and VIIA have tendency follow the octet principle That elements accept the electron to form negative ion Electronegative elements The charge value is the number of electron that was accepted The elements that have tendency to accept the electron have many relative of electron affinity or electro negativity Non metals elements by SeLly in Sept 2008, PTK

  12. Forming the negative ions of some elements by SeLly in Sept 2008, PTK

  13. Kind of chemical bonding 1. Ionic bonding 2. Covalent bonding 3. Coordinate covalent bonding Metallic bonding by SeLly in Sept 2008, PTK

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