1. Bonds How does an ionic bond form? How does a covalent bond form?
How does a metallic bond form?
What are the properties of ionic and covalent compounds?

2. Ions ion - an atom that has lost or gained electrons
Ions have a charge
If gained electrons
+ If lost electrons

3. Ionic Bond bond formed by a positive (+) and negative (-) ion
The positive (+) is usually a metal
left side of periodic table
The negative (-) is usually a nonmetal
right side of periodic table
REMEMBER: atoms want to get 8 valence electrons

4. Properties of Ionic Compounds
Hard
brittle
crystalline (solids)
High melting points (usually solid)
Conduct Electricity when dissolved in water

5. Covalent Bonds Formed when two atoms share electrons
attraction = sharing valence electrons
between two nonmetals
Can be Diatomic = 2x same element

6. Metallic Bonds Valence electrons move freely between atoms
attraction = moving valence electrons
Bond between two metals
Atoms are positive (+) ions

7. 1) An ion is an atom that Has a different number of neutrons
Has gained or lost electrons
Is in the middle of the periodic table
None of the above

8. 2) An ion that has gained electrons has a ____ charge
negative (-)
positive (+)
neutral (0)
None of the above

9. 3) An ionic bond is a bond formed by
Two positive ions
Two negative ions
A positive ion and negative ion
None of the above

10. 4) Which of the following is NOT a property of ionic compounds
crystalline
good thermal conductivity
hard
brittle

11. 5) Most ionic compounds can
Melt easily
Dissolve in water
Bend
None of the above