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Ions and Ionic Bonds. Ion = Atom that has lost or gained electrons; has a charge (+ or -) Atoms that Lose electrons Have a positive charge = +, 2+, 3+, etc. Called cations (“Cat Pos”) Atoms that Gain electrons Have a negative charge = -, 2-, 3-, etc. Called anions.

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Presentation Transcript
slide2
Ion = Atom that has lost or gained electrons; has a charge (+ or -)
    • Atoms that Lose electrons
      • Have a positive charge
      • = +, 2+, 3+, etc.
      • Called cations(“Cat Pos”)
    • Atoms that Gain electrons
      • Have a negative charge
      • = -, 2-, 3-, etc.
      • Called anions
slide3
Chemical bonds
    • Attractive force that holds atoms or ions together
  • Ionic Bond
    • bond formed by the attraction between oppositely charged ions
    • There is an electrostatic attraction between the ions
  • Electrons are transferred
    • Example: Na and Cl
    • Cl takes an electron from Na
    • Cl becomes Cl-
    • Na becomes Na+
    • Na+ is attracted to Cl-
    • Form ionic compound NaCl
slide4
Ionic bonds occur between a metal and a nonmetal
    • Metals on left side of Periodic Table
    • Nonmetals on right side of Periodic Table
  • Most ionic compounds are called salts
  • Example: Lithium combines with Chlorine to become LiCl
    • Li has 1 valence electron (has 1 extra)
    • Cl has 7 valence electrons (needs 1)
    • Cl takes Li extra valence electron
    • Cl becomes Cl-
    • Li becomes Li+
    • Li+ is attracted to Cl- and form an ionic bond
    • LiCl is the ionic compound that is formed
slide5

Lithium + Chlorine

-

+

Li

Cl

Li

Cl

Li+ + Cl- = LiCl

Lithium + Oxygen

2-

+

Li

O

Li

O

+

2 Li+ + O2- = Li2O

Li

Li