Development of the Periodic Table

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Development of the Periodic Table

• Chapter 5 Part 1

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The Periodic Table

• By the mid 1800s about 70 elements had been
  identified.
• There was not yet a system to organize them.
• Early attempts looked at some of the similarities
  but were not complete.

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Mendeleev Father of the Periodic Table

• Meyer also came to the same conclusion, but
  Mendeleev got the credit.

Table                                            
   
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The Modern Periodic Table

• Mosley took the Mendeleev and Meyers idea one
  step further. They had arranged the table based
  on the elements atomic mass.
• Mosley discovered how to find out the elements
  number of protons using X-rays.
• The modern periodic table is arranged by atomic
  number, the number of protons.

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How to Read the Periodic Table

• Top number is the Atomic Number. It is the number
  of protons which equals the number of electrons
• The bottom number is the Atomic Mass. The
  average number of Protons and Neutrons in an
  element.

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Good sources on the Web.

• For further reading and cool graphics on the
  periodic table (and also where I got most of my
  images for this presentation
• http//mooni.fccj.org/ethall/period/period.htm
• Another fun site
• http//www.privatehand.com/flash/elements.html

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Two New Elements

•                     WOMANIUM (WO) Physical
  properties Generally soft and round in form.
  Boils at nothing and may freeze any time. Very
  bitter if not used well. Chemical properties
  Very active and highly unstable. Possesses strong
  affinity with gold, silver, platinum, and
  precious stones. Violent when left alone. Turns
  slightly green when placed next to a better
  specimen. Usage An extremely good catalyst for
  dispersion of wealth. Caution Highly explosive
  in inexperienced hands!

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New Elements

• MANIUM (XY) Physical properties Solid at room
  temperature but gets bent out of shape easily.
  Difficult to find a pure sample. Due to rust,
  aging samples are unable to conduct electricity
  as easily as young samples. Chemical properties
  Attempts to bond with WO any chance it can get.
  Also tends to form strong bonds with itself.
  Becomes explosive when mixed with Childrium for
  prolonged period of time. Usage Possibly good
  methane source. Caution In the absence of WO,
  this element rapidly decomposes and begins to
  smell.