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Dmitri Mendeleev. Arranged elements by increasing atomic mass Predicted properties of missing elements. Episode 401. Henry Moseley. Discovered that each element has a unique atomic number Arranged elements by increasing atomic number

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Presentation Transcript
dmitri mendeleev
Dmitri Mendeleev
  • Arranged elements by increasing atomic mass
  • Predicted properties of missing elements

Episode 401

henry moseley
Henry Moseley
  • Discovered that each element has a unique atomic number
  • Arranged elements by increasing atomic number
  • Now all the elements fit into place based on properties

Episode 401

modern periodic law
Modern Periodic Law
  • Properties of elements repeat when elements are arranged by increasing atomic number
  • Periodic function or repeats

Episode 401

questions about the extended periodic table
Questions about the extended periodic table:
  • Why do you think these elements get pulled out?
    • It makes the periodic table more compact.
  • Which element is in a different column than we are used to?
    • He
  • What happens to the number of energy levels as you begin each new row?
    • Increases by 1
  • What is the similar characteristic in each column?
    • Electron distribution

Episode 401

elements in the same column
Elements in the same column:
  • Have similar electron distributions
  • Have same number of valence electrons
    • Electrons lost, gained, or shared
    • Found in the s and p orbital of highest energy level
  • Have similar chemical properties
    • Ne:
      • 1s2 2s2 2p6
    • Kr:
      • 1s2 2s2 2p6 3s2 4s2 3d10 4p6

Episode 401

noble gases
Noble Gases
  • Have full outer energy level
  • Have 8 valence electrons
  • Are stable
    • (inert or unreactive)

Episode 401

noble gas configuration
Noble Gas Configuration
  • Shorter way to do electron configurations using noble gases
  • Find noble gas on the end of row before the element and put its symbol in brackets.
  • Use diagonal rule to write the electron distribution for Sn (atomic # 50)
    • 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p2
  • Use the noble gas distribution to write electron distribution for Sn
    • [Kr] 5s2 4d10 5p2

Episode 401

noble gas configuration1
Noble Gas Configuration
  • Find noble gas on the end of row before the element and put its symbol in brackets.
  • Use diagonal rule to write the electron distribution for Fe (atomic # 26)
    • 1s2 2s2 2p6 3s2 3p6 4s2 3d6
  • Use the noble gas distribution to write electron distribution for Fe
    • [Ar] 4s2 3d6

Episode 401

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