The
Periodic Table: Periodic Table
Slide 12 of 37
The
Periodic Table
Fact
2: As you move
down through the periods an extra electron shell is added:
E.g. Lithium has
3 electron in the configuration 2,1
Potassium has 19 electrons in the configuration
__,__,__
Sodium has 11 electrons in the configuration
2,8,1