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The Periodic Table Review . Who is Mendeleev? How did Mendeleev organize the periodic table?. A. Dmitri Mendeleev. Dmitri Mendeleev (1869, Russian). Organized elements by increasing atomic mass . Predicted the existence of undiscovered elements. The Periodic Table . Who is Mosely?

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The Periodic TableReview

Who is Mendeleev?

How did Mendeleev organize the periodic table?


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A. Dmitri Mendeleev

  • Dmitri Mendeleev (1869, Russian)

  • Organized elements by increasing atomic mass.

  • Predicted the existence of undiscovered elements.


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The Periodic Table

Who is Mosely?

How did Mosely organize the periodic table?


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B. Henry Mosely

  • Henry Mosely (1913, British)

  • Organized elements by increasing

  • Fixed problems in Mendeleev’s arrangement.

atomic number



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The Periodic Table

On the periodic table where are the metals located?


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A. Metallic Character

Metals found on the left

  • Metals

  • Nonmetals

  • Metalloids


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The Periodic Table

Where are the non-metals?


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A. Metallic Character

Nonmetals are on the right

  • Metals

  • Nonmetals

  • Metalloids


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The Periodic Table

Where are the metalloids ?


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Metalloids are between the metals and nonmetals

A. Metallic Character

  • Metals

  • Nonmetals

  • Metalloids


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A. Metallic Character

  • Metals

  • Nonmetals

  • Metalloids


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The Periodic Table

Where are the representative elements ?


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B. Table Sections

  • Representative Elements

  • Transition Metals

  • Inner Transition Metals


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The Periodic Table

Where are the transition metals?


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B. Table Sections

  • Representative Elements

  • Transition Metals

  • Inner Transition Metals


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B. Table Sections

  • Representative Elements

  • Transition Metals

  • Inner Transition Metals


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Columns & Rows

  • Group (Family)

  • Period


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The Periodic Table

Periodic Trends


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A. Terms

  • Periodic Law

  • Properties of elements repeat periodically when the elements are arranged by increasing atomic number.


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A. Terms

  • Valence Electrons

    • e- in the outermost energy level


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1A

8A

2A

3A 4A 5A 6A 7A

B. Periodic Trends

  • Group # = # of valence e- (except He)

    • Families have similar reactivity.

  • Period # = # of energy levels


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C. Dot Diagrams

  • Dots represent the valence e-.

  • EX: Sodium

  • EX: Chlorine


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