Saturday, May 15, 2010
Lewis Dot Structure
The Lewis Dot structure was named after the scientist Gilbert L. Lewis. The Lewis Dot Structure is basically a diagrams that show the bonding between atoms of a molecule, and the lone pairs of electrons that may exist in the molecule. They are similar to electron dot diagrams in that the valence electrons in lone pairs are represented as dots, but they also contain lines to represent shared pairs in a chemical bonds the structure has single, double, triple etc... bonds. A Lewis structure can be drawn for any covalently bonded molecule, as well as coordination compounds. There are many rules in The Lewis Dot Structure for example is hydrogen (H), which has only a single valence electron and tends to react to attain either 0 or 2 valence electrons. When H has two electrons in its valence shell, it could be said to obey a "duet rule", and achieves a valence shell electron configuration equivalent to helium (He). Also The total number of electrons represented in a Lewis structure is equal to the sum of the numbers of valence electrons on each individual atom. Non-valence electrons are not represented in Lewis structures. Next is placing the lone pairs once the total number of available electrons has been determined, electrons must be placed into the structure. They should be placed initially as lone pairs. one pair of dots for each pair of electrons available. Lone pairs are most likely placed on the outside. The Lewis Dot Structure placing depends on the atom. More bonds the atom has it will be placed more towards the middle in the drawing.
Hint: H(Hydrogen) O(oxygen) N(Nitrogen) C(Carbon)
1 2 3 4........................ These are the number of bonds
Watch Video: Lewis Dot Structure
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