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First of all you need to know the electron configuration then you will know the valence electron, it is the electron in the outermost energy level. then write the element symbol, then put dots around it. the valence electron is the number of dots aroun
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Lewis electron dot structure show the symbol of the element and its valence electrons.  The steps in writing this are

1. get the atomic number of the element, this also corresponds to its electron number.  

2. write its electronic configuration to get its valence electrons. Valence electrons are  the electrons on the outermost shell.

3.Write the symbol of the element then place the dots that correspond to the number of valence electron around the symbol following the pattern top, bottom, left then right. Example Carbon has 4 valence electrons its lewis symbol is like this


.     C   .


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