Lewis Dot Diagrams Flashcards
What does a Lewis Dot Diagram show?
It shows the valence (outer shell) electrons of an atom.
How can you find out how many valence electrons an element has?
Look at the group number of the element on the periodic table.
What does each dot in a Lewis Dot Diagram represent?
Each dot represents a valence electron.
How many dots do you draw for an element in Group 2A (2)?
Draw 2 dots around the element’s symbol.
Why do we use Lewis Dot Diagrams?
They help us see how many valence electrons an atom has and how it might bond with other atoms.
If an element is in Group 5A (15), how many valence electrons does it have?
It has 5 valence electrons.
What does a Lewis Dot Diagram for an element in Group 7A (17) look like?
It has 7 dots around the element’s symbol.
How many valence electrons does an element in Group 1A (1) have?
It has 1 valence electron.
Why do atoms undergo most chemical reactions?
Atoms undergo chemical reactions to obtain a full outer electron shell.
How many electrons are typically needed in a full valence shell?
Typically, 8 electrons.
Which two elements are exceptions to the rule of having 8 electrons in the valence shell?
Hydrogen (H) and Helium (He).
How many electrons do Hydrogen and Helium need to have a full valence shell?
Hydrogen and Helium need 2 electrons to have a full valence shell.
The Lewis dot structure, represents the valence electrons around the chemical symbol. What is another name for the diagram?
The electron dot diagram
On a Lewis dot diagram, how many dots would you add for Magnesium?
2
On a Lewis dot diagram, how many dots would you add for oxygen?
6
On a Lewis dot diagram, how many dots would you add for Boron?
3
On a Lewis dot diagram, how many dots would you add for Iodine?
7
