Unit #1Unit #2Unit #3Unit #4Unit #5Unit #6Unit #7Unit #8Unit #9Unit #10
spacerUNIT # 4  
spacerspacerIntroduction
spacerspacerObjectives
spacerspacerReading


spacer4.1 The Periods
spacer4.2 The Groups
spacerGroup IA - Alkali metals
spacerGroup IIA - Alkaline earth metals
spacerGroup VIIA - Halogens
spacerGroup VIIIA - Noble gases
spacer4.3 Metals,
spacerNonmetals,
spacerSemimetals

spacerProperties of Metals
spacerProperties of Nommetals
spacerProperties of Semimetals
spacerSummary
spacer4.4 Metallic
spacerBonding

spacer4.5 Octet
spacerRule

spacer4.6 Ions
spacer
4.7 Covalent
spacerBonding

spacerCovalent Bonding & Groups
spacer
4.8 Atomic
spacerSize

spacer
4.9 Ionic
spacerSize

spacerIonic Size of Metal Ions
spacerIonic Size of Nonmetal Ions
spacerIonic Size for Isoelectronic Series
spacer
4.10 mp/bp
spacerTrends
spacer
4.11 Metallic
spacerTrend


spacer** More
spacerspacerperiodic
spacerTrends
**


spacerspacerProblems
spacer1 | 2 | 3
spacerspacerCrossword
spacerspacerHow well do you
spacerknow your
spacerPeriodic Table?
Unit #4 THE PERIODIC TABLE

4.7 - Covalent Bonding

4.7.1 - Covalent Bonds and Groups

The location of an element in the periodic table allows us to predict the number of covalent bonds that it can form.

  1. Hydrogen belonging to Group IA has one valence electron, shares this valence electron with another atom to form one covalent bond.
  2. Boron belonging to Group IIIA has three valence electrons, shares its valence electrons with other atoms to form three covalent bonds.
  3. Carbon and Silicon belonging to Group IVA have four valence electrons, shares their valence electrons with other atoms to form four covalent bonds.
  4. Nitrogen and Phosphorus belonging to Group VA has five valence electrons, shares three of its five valence electrons with other atoms to form three covalent bonds. The other two valence electrons form one nonbonding electron pair.
  5. Oxygen and Sulfur belonging to Group VIA has six valence electrons. These elements need two valence electrons to complete an octet of electrons. They share two of the six valence electrons with other atoms to form two covalent bonds. The other four valence electrons form two nonbonding electron pair.
  6. Fluorine, Chlorine, Bromine and Iodine belonging to Group VIIA has seven valence electrons. These elements need one valence electron to complete an octet of electrons. They share one of the seven valence electrons with other atoms to form one covalent bond. The other six valence electrons form three nonbonding electron pair.

Section 6.5
The Covalent Bond ..p128

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