Periodic Table Periodic Table Study GuideStudy Guide

88thth Grade Science Grade ScienceMs. DixonMs. Dixon

How to Draw Electron Dot Diagrams

1)1) Find your element on the periodic table.Find your element on the periodic table.

2)2) Determine the number of valence Determine the number of valence electrons.electrons.

3)3) This is how many dots you will draw.This is how many dots you will draw.

Electron Dot DiagramsElectron Dot Diagrams

Electron Dot DiagramsElectron Dot Diagrams Find out which Find out which

group (column) group (column) your element is your element is in.in.

This will tell you This will tell you the number of the number of valence electrons valence electrons your element has.your element has.

You will only You will only draw the valence draw the valence electrons.electrons.

Groups: ReviewGroups: Review

•Each column is called a “group”•Each element in a group has the same number of electrons in their outer energy level

Except for He, it has 2 electrons

•The electrons in the outer energy level are called “valence electrons”

Group 1 = 1 valence electronGroup 2 = 2 valence electrons

Group 18 = 8 valence electrons

1)1) Write the element Write the element symbol.symbol.

2)2) Carbon is in the 4Carbon is in the 4thth group, group, so it has 4 valence so it has 4 valence electrons.electrons.

3)3) Starting at the top and Starting at the top and going around an going around an imaginary box, draw 4 imaginary box, draw 4 electrons, or dots, electrons, or dots, clockwise around the clockwise around the element symbol.element symbol.

Electron Dot DiagramsElectron Dot Diagrams

1)1) Check your work.Check your work.

2)2) Using your periodic Using your periodic table, check that table, check that Carbon is in the 4Carbon is in the 4thth group.group.

3)3) You should have 4 You should have 4 total electrons, or total electrons, or dots, drawn in for dots, drawn in for Carbon.Carbon.

Electron Dot DiagramsElectron Dot Diagrams

In your notes, try these In your notes, try these elements on your own:elements on your own:

a)a) HH

b)b) PP

c)c) CaCa

d)d) ArAr

e)e) ClCl

f)f) AlAl

Electron Dot DiagramsElectron Dot Diagrams

Electron Dot DiagramsElectron Dot DiagramsIn your notes, try these In your notes, try these elements on your own:elements on your own:

a)a) HH

b)b) PP

c)c) CaCa

d)d) ArAr

e)e) ClCl

f)f) AlAl

Electron Dot DiagramsElectron Dot DiagramsIn your notes, try these In your notes, try these elements on your own:elements on your own:

a)a) HH

b)b) PP

c)c) CaCa

d)d) ArAr

e)e) ClCl

f)f) AlAl

Electron Dot DiagramsElectron Dot DiagramsIn your notes, try these In your notes, try these elements on your own:elements on your own:

a)a) HH

b)b) PP

c)c) CaCa

d)d) ArAr

e)e) ClCl

f)f) AlAl

Electron Dot DiagramsElectron Dot DiagramsIn your notes, try these In your notes, try these elements on your own:elements on your own:

a)a) HH

b)b) PP

c)c) CaCa

d)d) ArAr

e)e) ClCl

f)f) AlAl

Electron Dot DiagramsElectron Dot DiagramsIn your notes, try these In your notes, try these elements on your own:elements on your own:

a)a) HH

b)b) PP

c)c) CaCa

d)d) ArAr

e)e) ClCl

f)f) AlAl

Electron Dot DiagramsElectron Dot DiagramsIn your notes, try these In your notes, try these elements on your own:elements on your own:

a)a) HH

b)b) PP

c)c) CaCa

d)d) ArAr

e)e) ClCl

f)f) AlAl

End of Study NotesEnd of Study Notes

You should know how to You should know how to draw draw Electron Dot Electron Dot DiagramsDiagrams (Lewis (Lewis

Structures) for the Structures) for the first 20 elements.first 20 elements.