This document describes how to draw Lewis dot structures to represent the valence electrons of an atom based on its atomic number and electronic configuration. It explains that the valence electrons are those in the outermost shell and these electrons are represented as points or lines around the element's symbol. Examples are provided for hydrogen, boron, oxygen, and bromine to illustrate drawing the valence electrons to fill all sides of the element's symbol with electron pairs where possible.

1. Determination of the figure of Lewis of an
atom from the atomic number

2.  It is the representation of an atom
surrounded by its electrons of valence.
 The valence electrons are those that are
in the last level represent in the
electronically configuration.
 The atom is represented with the symbol
(just as in the periodic table) and the
electrons with points or crossings.

3. The steps
 First the electronic configuration of the
element is determined.
 The number of electrons in the last level
is identified (valence electrons).
 These electrons are drawn around the
symbol of the element (as points or
crossings).
 In each one of the four sides of the
symbol two electrons can be put at the
most.
 First it is tried to fill all the sides with an
electron and later pairs form.

4.  First the electronic configuration of the
element is determined that is desired to
represent.
In the case of hydrogen it will be:
1H = 1S1
Atomic it just has one valence electron
number
 The number of electrons of the last level
is identified.

5. The valence electrons are drawn around the
symbol of the element
Hydrogen
Symbol single valence electron
H *

6. Example:Boron
Electronic configuration :
5B=1S2,2S2,2P1
Last level Valence Electrons
Electrons occupy
* the greaternumber
B* possible sides
*

7. Example: Oxygen.
Configuration:
8 O = 1S2,2S2,2P4
last level valence electrons

8. Oxygen Symbol
Paired Electrons
..
. O .
..
Dispaired Electron
Maximum 2 electrons by side Total of 6 points then (so that they
represent orbital) that is its valence

9. Example: Br.
Configuration.
Number valence electrons: 7
35 Br =1S2,2S2,2P6,3S2,3P6,4S2,3d10,4P5
Last level It is not part of last level

10. Bromine
electronic Pairs
.. Dispaired Electron
:Br .
..