4-1 Ions & Ionic Bonding
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4-1 Ions & Ionic Bonding

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4-1 Ions & Ionic Bonding 4-1 Ions & Ionic Bonding Presentation Transcript

  • Warm-Up
    • Which metals are the most reactive?
      • Alkali metals
    • Which non metals are the most reactive?
      • Halogens
    • Why don’t metals in group 1A have identical properties?
      • Elements in group 1A don’t have identical properties because their valence electrons are in different energy levels.
  • 4-1 Ions & Ionic Bonding
    • Recognize stable electron configurations.
    • Predict an element’s chemical properties using number of valence electrons and electron dot diagrams.
  • Stable Electron Configuration
    • The highest occupied energy level of an atom is filled with electrons.
    • Nobel gases have 8 valance electrons (He-2).
    • The highest energy level is completely full.
    • Noble gases are colorless, odorless, and un-reactive .
      • Very few compounds form with Nobel gases.
  •  
  • Electron-Dot Diagram
    • A model of the atom to represent the valence or outer shell electrons.
    • The number of dots = number of valence electrons.
    • The symbol in the center represents the nucleus and all other electrons.
    • Electron dot diagram helps to determine stability.
  •  
  • Formation of Ions
    • Atoms that lose or gain electrons are called ions .
    • Ions are charged atoms.
    • Ions have unequal numbers of protons and electrons.
    • Charge can be positive or negative.
    • Ions are formed because atoms want to have a stable electron configuration.
  • Types of Ions
    • Positive ions
      • Lose electrons or lose negative charge.
      • Subtracting negatives = positives.
      • Atoms that have lost electrons are called cations (“cat-ions”)
      • Metals
    • Negative Ions
      • Gain electrons or gain negative charge.
      • Atoms that have gained electrons are called anion (“ant-ion”).
      • Nonmetals
  • Na + Al 3+ K + Mg 2+ Ca 2+
  • N 3- F - P 3- O 2- S 2- Cl -
  • Ionic Bonds
    • Chemical bonds is a force that holds atoms together as a unit.
      • Ionic bonds are the cations being attracted to the anions
      • Particles with opposite charges are attracted.
    • Ionic bonds are formed when atoms transfer electrons from one atom to another.
  •  
  •  
  • Ionic Compounds
    • Compounds are substances that contain more that one atom in chemical ratios.
    • The ratio is known as the chemical formula.
    • Ions don’t bond in random ways.
    • Ion will bond with the number of atoms to give a full shell of electrons.
    • Ions also bond to balance charges.
  • Summary
    • What happens to atoms when they form ionic bonds?
      • One atom in the compound had to loose an electron and one atom in the compound had to gain an electron.
    • What type of elements form ionic bonds?
      • Metal and nonmetal