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The periodic table2

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The periodic table2

  1. 1. THE PERIODIC TABLE
  2. 2. History of PeriodicTable Dmitri Mendeleev , a Russian chemist, was the first scientist to make a periodic table much like the one we use today. Mendeleev arranged the elements in a table ordered by atomic weight , corresponding to relative molar mass as defined today. It is sometimes said that he played "chemical solitaire" on long train journeys using cards with various facts of known elements. [10] On March 6, 1869, a formal presentation was made to the Russian Chemical Society, entitled The Dependence Between the Properties of the Atomic Weights of the Elements . His table was published in an obscure Russian journal but quickly republished in a German journal, Zeitschrift für Chemie (Eng., "Chemistry Magazine"), in 1869.
  3. 3. Describe the Periodic Table <ul><li>The periodic table is a chemistry reference   </li></ul><ul><li>It arranges all the known elements in an informative grid  </li></ul>
  4. 4. Describe the Periodic Table <ul><li>Elements are arranged left to right and top to bottom in order of increasing atomic number </li></ul><ul><li>This order usually coincides with increasing atomic mass </li></ul>
  5. 5. Describe the Periodic Table <ul><li>The Table's pattern and arrangement shows the arrangement of electrons in the atom. </li></ul><ul><li>Elements have different atomic numbers - the number of protons or electrons increases up the table as electrons fill the shells. </li></ul>
  6. 6. Describe the Periodic Table <ul><li>Elements have different atomic masses - the number of protons plus neutrons increases up the table. </li></ul><ul><li>Rows - elements of each row have the same number of energy levels (shells). </li></ul><ul><li>Columns - elements have the same number of electrons in the outermost energy level or shell (one to eight). </li></ul>
  7. 7. Describe the Periodic Table <ul><li>The different rows of elements are called periods .  </li></ul><ul><ul><li>The period number of an element signifies the highest energy level an electron in that element occupies </li></ul></ul><ul><li>The different columns of elements are called groups or families </li></ul><ul><ul><li>Elements in the same family have similar properties </li></ul></ul>
  8. 8. Describe the Periodic Table
  9. 9. Describe How To Read The Periodic Table
  10. 10. Describe how to read the periodic table: <ul><li>Every table has: </li></ul>
  11. 11. Describe how to read the periodic table: <ul><li>Atomic Number </li></ul><ul><li>The number of protons in an atom identifies the element.  </li></ul><ul><li>  The number of protons in an atom is referred to as the atomic number of that element. </li></ul>
  12. 12. Describe how to read the periodic table: <ul><li>Atomic Symbol: The atomic symbol is one or two letters chosen to represent an element (&quot;H&quot; for &quot;hydrogen,&quot; etc.).  </li></ul><ul><li>These symbols are used every where in the world </li></ul><ul><li>   Usually, a symbol is the abbreviation of the element or the abbreviated Latin name of the element. </li></ul>
  13. 13. Describe how to read the periodic table: <ul><li>Atomic Mass: The atomic mass is the average mass of an element in atomic mass units (&quot;amu&quot;).  </li></ul><ul><li>Though individual atoms always have a whole number of amus, the atomic mass on the periodic table is shown as a decimal number because it is an average of all the isotopes of an element. </li></ul>
  14. 14. http://www.chemicalelements.com/
  15. 15. REFERENCES http://www.chemsoc.org/viselements/pages/periodic_table.html
  16. 16. REVIEW THE PERIODIC TABLE WITH THE PERIODIC TABLE ADVENTURE: http://web.buddyproject.org/web017/web017/ Reference……………..http://science.pppst.com/

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