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The Metallic bond

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  1. The Metallic bond

  2. Cu1+ Cu1+ Cu1+ Cu1+ Cu • Cu • Cu • Cu • Cu • Cu • Cu • Cu • Cu1+ Cu1+ Cu1+ Cu1+ Cu • Cu • Cu • Cu • Cu1+ Cu1+ Cu1+ Cu1+ The Metallic bond • A metallic bond is formed when a group of metallic atoms “communally” share their valence electrons with the group. • When metal atoms “lose” their valence electrons, they become cations (positive ions). Ex. (1)

  3. • Cu1+ Cu1+ Cu1+ Cu1+ • • • • Cu1+ Cu1+ Cu1+ Cu1+ • • • Cu1+ Cu1+ Cu1+ Cu1+ • • The Metallic bond • The metallic cations are held together by a mobile sea of electrons (usually valence electrons) that were donated by each individual member of the group. • In this way, each metallic cation achieves a full valence and stability. Ex. (1) copper metal

  4. Zn : Zn : Zn : Zn : Cu • Zn : Cu • Zn : Cu1+ Zn2+ Cu1+ Zn2+ Zn2+ Zn2+ Zn2+ Zn2+ • • Zn : Cu • Zn : Cu • Zn : Zn : Zn : Zn : • • Zn2+ Cu1+ Zn2+ Cu1+ Zn2+ Zn2+ Zn2+ Zn2+ • • • • • • • • Cu • Zn : Cu • Zn : Zn : Zn : Zn : Zn : Zn2+ Zn2+ Zn2+ Zn2+ Cu1+ Zn2+ Cu1+ Zn2+ • • • • • • • • • • The Metallic bond Ex. (2) Ex. (3) Zinc Metal Brass Metal

  5. • • • Al : Al : • • • • • • • • Al : Al : • • • Al3+ Al3+ Al3+ Al3+ The Metallic bond Aluminum Metal Ex. (4) Ex. (5) Write “PCB” under the formulas that have polar covalent bonding and “NPCB” under the formulas that have nonpolar covalent bonding . O3 CH4 I2 NH3 NPCB PCB NPCB PCB

  6. The Metallic bond Ex. (6) Under formulas write “IB” for ionic bonding, “MB” for metallic bonding, “PCB” forpolarcovalent bonding, “NPCB” for nonpolar covalent bonding, and “NB” if no bonding is present. FeCl3 H2S Au C Na2O Fe PH3 Rn SiO2 MgS He P4 IB PCB MB NPCB IB MB PCB NB PCB IB NB NPCB

  7. • • • O • • • • • • • • _ • • • Br Br H H • • • • • • • The Metallic bond Ex. (7) Draw a Lewis dot structure for: (a) calcium oxide and (b) hydrogen bromide. (a) (b) scratch work final answer • • [ ] 2+ [ ] 2- • • • O Ca Ca • • • • • • • Br H • • • •