Adapted from www.middleschoolscience.com 2008 How to Draw Dot Diagrams or Lewis Structures
Adapted from
www.middleschoolscience.com 2008
How to Draw Dot Diagrams or Lewis Structures
Review - Discussion
•How do you determine the information needed to draw the Bohr diagram of an atom?
Needed Information
• Valence electrons are the outermost electrons.
• How do you find the number of valence electrons?–The last number of the group number–Ex. Group 1 = 1, Group 18 = 8
• The highest number of valence electrons = 8. This is your magic number except for H and He!
• Maximum of 2 electrons per side.
Ne
Dot Diagrams or Lewis Structures• Find out which group
your element is in.• This will tell you the
number of valence electrons your element has.
• You will only draw the valence electrons.
www.chem4kids.com
Groups - Review
•Each column is called a “group”
•Each element in a group has the same number of electrons in their outer orbital, also known as “shells”.
Except for He, it has 2 electrons
•The electrons in the outer shell are called “valence electrons”www.chem4kids.com
Lewis Structures1) Write the element
symbol.2) Carbon is in the 4th
group, so it has 4 valence electrons.
3) Starting at the right, draw 4 electrons, or dots, counter-clockwise around the element symbol.
4) Check your work!
Lewis Structures
Try these elements:a) Hb) Pc) Cad) Are) Clf) Al
Lewis Structures
Try these elements:a) Hb) Pc) Cad) Are) Clf) Al
Lewis Structures
Try these elements:a) Hb) Pc) Cad) Are) Clf) Al
Lewis Structures
Try these elements:a) Hb) Pc) Cad) Are) Clf) Al
Lewis Structures
Try these elements:a) Hb) Pc) Cad) Are) Clf) Al
Where are you on the scale?• 1: I can find the information but cannot
make the diagrams.• 2: I can make the diagrams most of the
time.• 3: I can consistently create the
diagrams.• 4: I can show others how to make the
diagrams and am ready to start combining dot diagrams.
Lewis Structures
Try these elements:a) Hb) Pc) Cad) Are) Clf) Al
Lewis Structures
Try these elements:a) Hb) Pc) Cad) Are) Clf) Al
Discussion
• Compare and contrast Bohr diagrams to Dot diagrams.