1. List facts that you remember about ionic and covalent compounds
Bellwork Wednesday
List facts that you remember about ionic and covalent compounds

2. Unit 11Ch 7& 8
Chapter Ionic Bonding

3. Electron Configuration in Ionic Bonding
Valence Electrons – the electrons in the highest occupied energy level of an element’s atoms
To find the number of valence electrons look at the element’s group number 1 8 2 3 4 5 6 7

4. Electron Configuration in Ionic Bonding
Electron dot structure - System of arranging dots representing valence electrons.
G.N. Lewis developed this system and so they are also referred to as Lewis Dot Structures.

5. Example: Write the electron configuration for phosphorous.
1s22s22p63s23p3
Write the orbital diagram for phosphorous.
___ ___ ___ ___ ___ ___ ___ ___ ___
1s 2s 2p s p
Write the Lewis dot structure for phosphorous.

6. Practice Write Lewis dot structures for the following.Mg S Cl Rb Si Ar

7. Octet Rule
Octet rule – in forming compounds, elements tend to achieve the electron configuration of a noble gas.
Metals will typically lose electrons and therefore become positive
Na ___ ___ ___ ___ ___ ___
1s 2s 2p 3s
Ne ___ ___ ___ ___ ___ ___ +

8. Octet Rule
Nonmetals will typically gain electrons and therefore become negative
O ___ ___ ___ ___ ___
1s 2s 2p
Ne ___ ___ ___ ___ ___
1s 2s 2p 2-

9. Electron Configuration in Ionic Bonding
Electron dot symbols, Lewis dot structures, can be used to represent ions also.
EXAMPLES:
Na Cl F Mg O Al - - 2+ + 2- 3+