Periodic Table of Elements

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Periodic Table of Elements
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chlorine
nitrogen
silver
gold
mercury
oxygen
hydrogen
helium
sodium
niobium
neodymium
carbon
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Elements

• The elements, alone or in combinations, make up
  our bodies, our world, our sun, and in fact, the
  entire universe.

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Elements

• Science has come along way since Aristotles
  theory of Air, Water, Fire, and Earth.
• Scientists have identified 90 naturally occurring
  elements, and created about 28 others.

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The most abundant element in the earths crust is
oxygen.
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What is the purpose of the Periodic Table?

• Early chemists working throughout the world,
  speaking different languages, wanted to tell each
  other about their discoveries.
• They needed a way to write about the elements,
  compounds and chemical reactions so that all
  scientists could understand.
• For this reason, the periodic table was
  developed.

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Pre Periodic Table

• Before the periodic table was created there was
  no organization to Chemistry!
• Imagine a grocery store with no organization!
• Chemistry didnt make sense!

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History of the Periodic Table

• Dmitri Mendeleev organized the periodic table in
  1869 when there were only 63 elements.
• He organized each of the elements according to
  their atomic masses.
• As new elements were discovered they fit into
  Mendeleevs basic framework for the periodic
  table.

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The Elements

• The periodic Table gives a list of all of the
  different kinds of elements.
• Each element is unique and arranged in a specific
  way.