13 Lewis StructuresAll you have to do for a Lewis Structure is draw Dots around an Element’s SymbolBut How Many????
14 So…The amount of dots you draw for a Lewis Structure (LS for short) is equal to the # of Valence Electrons in an Atom
15 Review: Valence Electrons The # of Valence e- an atom has is dictated by the Group the Element is inGroups are the Vertical Columns on the Periodic Table!!! It’s So Simple!!!!
16 Lewis Dot DiagramsThe Lewis Dot Structure is a bit different from the Bohr model.It only shows the element symbol and it’s outer most electron shell.
17 Step 1: Write the Element Symbol Step 2: Find the number of electrons in the last energy level of the Bohr Model (Valence Electrons)Step 3: Place the electrons (dots) around the symbol in clockwise order so that there are no more than 2 electrons per side.
18 Practice:The First Two Are Tricky so pay attention
19 Practice:All Elements in the first group have only 1 Valence e-
20 Practice:All Elements in the first group would have a LS like this:H
21 Practice:All Elements in the second group have only 2 Valence e-
22 Practice: But what about Helium!!! It only has 2 e- so it can only have 2 e- in its Valence Shell
23 Practice:All Elements in the second group would have a LS like thisHe