Download
periodic table n.
Skip this Video
Loading SlideShow in 5 Seconds..
Periodic Table PowerPoint Presentation
Download Presentation
Periodic Table

Periodic Table

166 Views Download Presentation
Download Presentation

Periodic Table

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Periodic Table The Atom and the Elements

  2. Periodic Table • In 1872, Dmitri Mendeleev arranged the 60 known elements into columns or groups with similar properties.

  3. Periodic Table • Today’s periodic table contains 117 elements arranged in order of increasing atomic number.

  4. PERIODIC TABLE • Arranges similar elements together in patterns • Arranged by the # of protons or atomic number • Helps predict properties of an element PERIODIC LAW – states that when elements are arranged in order by # of protons, similarities in properties will occur in a pattern

  5. Today’s Element List • 10 = 99% of the mass of the Earth (5=92%) (O,Si,H, Al, Fe, Ca,Na,Mg, Cl,K)

  6. Metals Shiny Solids Stretched and Shaped Conductors of heat and electricity Nonmetals Solids, liquids or gases Solids – dull and brittle Poor conductors of heat and electricity ****Semiconductors / Metalloids – exhibit properties of both metals and nonmetals FAMILIES OF ELEMENTS

  7. How do you tell if it’s a metal, nonmetal, or metalloid? • Metals • On the left hand side of the zigzag line (except for Hydrogen – exception) - Metalloids or Semi-metals - Touching zigzag line (Except for Al) - Exhibit properties of both metals and nonmetals • Nonmetals • On the right hand side of the zigzag line (plus Hydrogen)

  8. How would you classify calcium? • Metal • Nonmetal • Metalloid

  9. How would you classify arsenic? • Metal • Nonmetal • Metalloid

  10. How would you classify carbon? • Metal • Nonmetal • Metalloid

  11. GROUPS PERIOD To keep table shorter/ in line

  12. GROUPS • Columns of the periodic table • Atoms of elements in the same group have the same # of valence electrons and therefore behave similarly PERIODS • Rows of the periodic table • All elements in a period have the • their valence electrons in the same energy level.

  13. Which of the following are in the same group? • H, He, C, Li • K, Ca, As, Br • He, Ne, Kr, Ar • B, Al, Ge, Sn

  14. Which of the following are in the same period? • H, He, C, Li • K, Ca, As, Br • He, Ne, Kr, Ar • B, Al, Ge, Sn

  15. Representative and Transition Elements

  16. METALS • 4 Different kinds of metals • Alkali metals: soft, shiny and very reactive • Group 1: not found in nature as elements • Alkaline earth-metals: less reactive • Group 2: have two valence electrons • Transition Metals: many uses • Groups 3-12

  17. NONMETALS • 3 Different kinds of metals • Noble Gases: mostly non-reactive, very stable • Group 8: He, Ne, Ar, Kr, Xe, Rn • Halogens: very reactive, gain one electron to form a stable compound • Group 7: F, Cl, Br, I

  18. Diatomic Gases • Seven elements are called diatomic and never exist alone in nature. • Have No Fear Of Ice Cold Beans????? • H2 • N2 • F2 • O2 • I2 • Cl2 • Br2

  19. Magnesium is in which group? • Alkali metals • Alkaline earth metals • Transition metals • Halogens • Noble gases

  20. Lithium is in which group? • Alkali metals • Alkaline earth metals • Transition metals • Halogens • Noble gases

  21. Manganese is in which group? • Alkali metals • Alkaline earth metals • Transition metals • Halogens • Noble gases

  22. Krypton is in which group? • Alkali metals • Alkaline earth metals • Transition metals • Halogens • Noble gases

  23. The majority of the diatomic gases are in which group? • Alkali metals • Alkaline earth metals • Transition metals • Halogens • Noble gases