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Periodic Table

Periodic Table. HISTORY. Mid-1800’s 60 elements identified 5 were nonmetal gases @ room temperature. H 2 , O 2 , N 2 , F 2 , Cl 2 . Liquids – Hg, Br Rest were solids with varying properties. History cont…. Placement of similar property elements. Dimitri Mendeleev – Russian

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Periodic Table

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  1. Periodic Table

  2. HISTORY • Mid-1800’s • 60 elements identified • 5 were nonmetal gases @ room temperature. H2, O2,N2, F2, Cl2. • Liquids – Hg, Br • Rest were solids with varying properties.

  3. History cont… • Placement of similar property elements. • Dimitri Mendeleev – Russian • Periodic Table resembles Calendar. • What other exhibits of periodicity? • Atoms of different elements have different Mass. • Atomic weights assigned.

  4. History cont… • Combining Capacity- 1 of two ways to organize elements. • ECl – “Element combining with” Chlorine. 1 to 1 combinations. (KCl, CsCl) • MgCl2 – Magnesium Chloride, ECl2

  5. Atomic Number • The number of protons in an atom. • Distinguishes different elements.

  6. Nucleus • “Center” of atom that is an area of + positive charge. • Along with NEUTRONs…protons make up the MASS NUMBER.

  7. Isotopes • Atoms of the same atomic number(# of protons), can have different MASS #. They are called ISOTOPES. • Atoms of the same element, but with different mass number. • Carbon 12 • Carbon 14

  8. Table Sections • Metals • Mettaloids • NonMetals

  9. Rows & Columns • Rows – Periods • Columns – Family • Hockey • Tree

  10. Names of Families • Alkali Metals • Alkalia Earth Metals • Transition Metals • Boron Group • Carbon Group • Nitrogen Group • Oxygen Group • Halogen Group • Noble Gases

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