1. ionic, covalent, and metallic
Bonding
ionic, covalent, and metallic

2. The name’s Bond…Ionic Bond
Ionic bonds are formed between ions of opposite charges
Formed due to the TRANSFER of electrons
Formed between a metal cation and a nonmetal anion
Substances held together by ionic bonds are called ionic compounds

3. The Name’s Bond, Ionic Bond

5. The Name’s Bond, Ionic Bond
Properties of Ionic Compounds
Form crystals
Hard and brittle
VERY high melting points
Good conductors when dissolved in water

6. The name’s Bond, Metallic Bond
Formed between atoms of metallic elements
Positively charged nuclei held together by a “sea of electrons”

7. The name’s Bond, Metallic Bond
Properties of Metallic bonds
Very good conductors
Lustrous
Very high melting points

8. The name’s Bond, Metallic Bond
Since electrons are free to move around in metallic bonds, metals don’t bond with other metals
Instead they form mixtures called Alloys
Alloy examples: steel, brass, bronze, and pewter

9. The name’s Bond, Covalent Bond
Formed between nonmetallic atoms
Formed due to SHARING of electrons
Substances held together by covalent bonds are called molecules

10. The Name’s Bond, Covalent Bond

11. The name’s Bond, Covalent Bond
Properties of covalent molecules
Low melting points
Softer and ‘squishier’ then ionic compounds
Do not conduct electricity as solids or while dissolved in water.

12. The name’s Bond, Covalent Bond
How evenly the electrons are shared, depends on the electronegativity of the two elements involved
Electronegativity: the ability of an atom to attract electrons to itself when bonded to another atom

13. The name’s Bond, Covalent Bond

14. The name’s Bond, Covalent Bond
When the electronegativity difference between the bonded atoms is small, the electrons are shared evenly the bond is said to be non-polar

15. The name’s Bond, Covalent Bond
When the electronegativity difference between the bonded atoms is great, the electrons are unevenly shared and the bond is said to be polar.

16. The name’s Bond, Covalent Bond
In polar covalent bonds, one atom becomes partially positively charged and one becomes partially negatively charged
This is shown using + and -

17. The name’s Bond, Covalent Bond
Practice
Label the partial positive and the partial negative side of the polar bonds
O-F C-Cl H-F