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Chemical Bonds

Chemical Bonds. IONIC BOND bond formed between two ions by the transfer of electrons. Ionic Bond. Between atoms of metals and nonmetals with very different electronegativity Bond formed by transfer of electrons

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Chemical Bonds

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  1. Chemical Bonds

  2. IONIC BONDbond formed between two ions by the transfer of electrons

  3. Ionic Bond • Between atoms of metals and nonmetals with very different electronegativity • Bond formed by transfer of electrons • Conductors when ions are free to move ( dissolved or molten ) . Have high melting point. • Lattice enthalpy • Examples; NaCl, CaCl2, K2O

  4. Ionic Bonds: One Big Greedy Thief Dog!

  5. 1). Ionic bond – electron from Na is transferred to Cl, this causes a charge imbalance in each atom. The Na becomes (Na+) and the Cl becomes (Cl-), charged particles or ions.

  6. COVALENT BONDbond formed by the sharing of electrons

  7. Covalent Bond • Between nonmetallic elements of similar electronegativity. • Formed by sharing electron pairs • Bond dissociation energy kJ/mol • Not conductors at any state • Examples; O2, CO2, C2H6, H2O, SiC

  8. Covalent Bonds

  9. picometer

  10. NONPOLAR COVALENT BONDS when electrons are shared equally H2 or Cl2

  11. 2. Covalent bonds- Two atoms share one or more pairs of outer-shell electrons. Oxygen Atom Oxygen Atom Oxygen Molecule (O2)

  12. POLAR COVALENT BONDS when electrons are shared but shared unequally H2O

  13. Polar Covalent Bonds: Unevenly matched, but willing to share.

  14. - water is a polarmolecule because oxygen is more electronegative than hydrogen, and therefore electrons are pulled closer to oxygen.

  15. METALLIC BONDbond found in metals; holds metal atoms together very strongly

  16. Metallic Bond • Formed between atoms of metallic elements • Electron cloud around atoms • Good conductors at all states, lustrous, very high melting points • Examples; Na, Fe, Al, Au, Co

  17. Metallic Bonds: Mellow dogs with plenty of bones to go around.

  18. Metallic Bond, A Sea of Electrons

  19. Metals Form Alloys Metals do not combine with metals. They form Alloys which is a solution of a metal in a metal. Examples are steel, brass, bronze and pewter.

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