1. Unit 5 – Bonding Mrs. Callender
Valence Electrons
Unit 5 – Bonding
Mrs. Callender

2. What are Valence Electrons and What are Their Uses?
Lesson Essential Question:

3. Valence Electrons
They are electrons in the outermost shell.
They are used in bonding.

4. Nitrogen Group or Group 15 has 5 valence e-s. (s2p3)
Chalcogen Group or Group 16 has 6 valence e-s. (s2p4)
Noble Gases or Group 18 has 8 valence e-s. (s2p6) Exception: Helium which has two valence e-s since it is a s2.
Alkali Metals have one valence e-. (s1)
Carbon Group or Group 14 has 4 valence e-s. (s2p2)
Alkaline Earth Metals have two valence e-s. (s2)
Boron Group or Group 13 has 3 valence e-s. (s2p1)
Halogen Group or Group 17 has 7 valence e-s. (s2p5)
Transition Metals or “d block” elements have 1 or 2 valence e-s.
Lanthanide and Actinide Series Elements or “f block” elements have 1 or 2 valence e-s.

5. X X X X X X X X Dot Designations
Valence Electrons can be represented by Lewis Dot Structures.
1 valence e-
2 valence e-
3 valence e-
4 valence e- X X X X
5 valence e-
6 valence e-
7 valence e-
8 valence e- X X X X

6. Dot Designations For Period 3
Write the Lewis Dot Structures for the elements in Period 3.
1 valence e-
2 valence e-
3 valence e-
4 valence e- Na Mg Al Si
5 valence e-
6 valence e-
7 valence e-
8 valence e- P S Cl Ar