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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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