Ionic Bonds Chemistry Mrs. Coyle Part A: Ions Lewis Dot Structure Stable Octet (or Duet)
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Transcript of Ionic Bonds Chemistry Mrs. Coyle Part A: Ions Lewis Dot Structure Stable Octet (or Duet)
Valence Electrons
Valence electrons are the electrons in the highest occupied energy level of the atom.
Valence electrons are the only electrons generally involved in bond formation.
Electron Configuration of Sodium
1s2 2s2 2p6 3s1
Which is the valence electron for Na?
Answer: 1s2 2s2 2p6 3s1
Electron Dot Structure or Lewis Dot Diagram
A notation showing the valence electrons surrounding the atomic symbol.
When Na, (Z= 11) loses its valence electron, what element does its configuration look like ?
a. Neon
b. Potassium
c. Beryllium
d. Sodium
Check your Neighbor
When Na, (Z= 11) loses its valence electron, what element does its configuration look like ?
a. Neon
b. Potassium
c. Beryllium
d. Sodium
Check your Neighbor
When the valence shell is full, the
atom is stable, less likely to react.
Example: Noble (Inert Gases)
Kr
A Stable Octet
Bonding
Elements that do not have a complete octet, tend to react.
When the elements react bonds are formed.
Ionic Bonds
Bonds that are formed by transfer of electrons from one element to the other.
Each element (now an ion) will have a complete octet after the transfer of electrons.
Formula Unit
A chemical formula that shows the lowest whole number ratio of the atoms (ions) in an ionic compound.
Example: KCl, Mg Cl2