1. Use the periodic table to find the missing
information
Chlorine (Cl)
1.Number of protons
2.Number of electrons
3.Number of neutrons
4.Number of energy shells
5.Number of valence electron(s)
17
17
18
3
7

2. ReviewReview
IsotopesIsotopes

3. CompoundsCompounds
Matter made up ofMatter made up of
two or more elementstwo or more elements
chemically combinedchemically combined
The elements loseThe elements lose
their individualtheir individual
propertiesproperties

4. CompoundsCompounds
The new compoundsThe new compounds
formed have newformed have new
propertiesproperties
Ratio of their parts areRatio of their parts are
exactexact
NaCl, HNaCl, H22O, COO, CO22

5. CompoundsCompounds
Molecule-smallestMolecule-smallest
unit of a compoundunit of a compound

6. Ionic BondIonic Bond
Strong attractiveStrong attractive
force between ions offorce between ions of
opposite chargesopposite charges

7. Ionic BondIonic Bond
Valence electrons can beValence electrons can be
transferredtransferred
From one atom to anotherFrom one atom to another
If an atom gains or losesIf an atom gains or loses
electrons, it becomeselectrons, it becomes
electrically chargedelectrically charged
IonIon

9. Ionic BondIonic Bond
Ionic compounds areIonic compounds are
usually formed from ausually formed from a
metal and a nonmetalmetal and a nonmetal

10. Ionic Bond
•NaCl
•MgO

12. Properties of Ionic CompoundsProperties of Ionic Compounds
Form strong 3-D crystalForm strong 3-D crystal
structuresstructures
Hard, rough, and brittleHard, rough, and brittle
Solid at room tempSolid at room temp
High melting pointsHigh melting points

13. Properties of Ionic CompoundsProperties of Ionic Compounds
Tend to dissolve inTend to dissolve in
waterwater
This solution conductsThis solution conducts
electricity very wellelectricity very well