daily inquiry 11 12 2012 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Daily Inquiry : 11-12-2012 PowerPoint Presentation
Download Presentation
Daily Inquiry : 11-12-2012

Loading in 2 Seconds...

play fullscreen
1 / 10

Daily Inquiry : 11-12-2012 - PowerPoint PPT Presentation


  • 66 Views
  • Uploaded on

Daily Inquiry : 11-12-2012. Using the periodic table, determine the number of protons and electrons in a chlorine atom. 2. Provide the electron configuration notation for chlorine. Identify which group and period chlorine is located on the periodic table.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Daily Inquiry : 11-12-2012' - chung


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
daily inquiry 11 12 2012
Daily Inquiry: 11-12-2012
  • Using the periodic table, determine the number of protons and electrons in a chlorine atom.

2. Provide the electron configuration notation for chlorine.

  • Identify which group and period chlorine is located on the periodic table.
  • Is chlorine considered a metal, nonmetal, or metalloid?

Explain your choice.

5. Name two other elements that would have similar chemical

properties as chlorine. Explain your choices.

history of the periodic table
History of the Periodic Table
  • Russian chemist Dmitri Mendeleev (1869) wanted to organize known elements by properties.
  • When he arranged elements by increasing atomic weights, he noticed that similar elements occurred at regular intervals.
mendeleev s periodic table
Mendeleev’s Periodic Table
  • He called his chart the “periodic” table.
mendeleev s periodic table1
Mendeleev’s Periodic Table
  • In order for similar elements to line up, Mendeleev left gaps in his chart.
  • Mendeleev stated these were undiscovered elements. He made predictions about these undiscovered elements based on the other elements in the same row.
  • By 1886, these elements (scandium, gallium, and germanium) were discovered and their properties closely matched his predictions.
mendeleev has unresolved issues
Mendeleev has Unresolved Issues
  • With the discovery of Mendeleev’s predicted elements, most chemists were persuaded to accept his table. However, there were two issues unresolved by his table.
  • What caused elements to have similar properties?
  • Why were there certain cases when a heaver element had to be placed in front of a light element so properties would line up? (Te and I)
modern periodic table
Modern Periodic Table
  • Instead of using atomic weights, today’s table is arranged by atomic number.
  • When atomic numbers are used, the inconsistency with iodine and tellurium works itself out.
  • Periodic Law – when elements are arranged by increasing atomic numbers, elements with similar chemical and physical properties occur at regular intervals.
organization of the periodic table
Organization of the Periodic Table
  • Today the periodic table arranges elements by groups and periods.
  • Group – vertical column of elements

Elements within the same group share similar properties. (also called families)

  • Period – horizontal row of elements

Atomic number increases as you go across a period.

changes in the periodic table
Changes in the Periodic Table
  • There have been significant changes to the periodic table since Mendeleev created his chart.
  • Noble Gases– elements that make up group 18. Include He, Ne, Ar, Kr, Xe, and Rn.
      • Extremely unreactive gases.
      • Very stable elements that will not combine with other atoms in nature.
changes in the periodic table1
Changes in the Periodic Table

(b)Lanthanide series– elements 58-71

    • Also called rare earth elements since they are hard to identify and separate.
    • These elements are part of period 6.
  • Actinide series – elements 90-103
    • Most are synthetic or radioactive.
    • These elements are part of period 7.