the periodic table an introduction
DESCRIPTION
Johann Dobereiner 1829 Organized the elements into triads, or groups of three based on properties.TRANSCRIPT
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The Periodic Table
An Introduction
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Johann Dobereiner
• 1829• Organized the elements into triads, or
groups of three based on properties.
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John Newlands
• 1863• Organized the elements by octaves, or
groups of eight, because some properties repeated every 8th element.
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Dmitri Mendeleev• 1869• Published a table of the elements arranged by
increasing atomic mass.• Called the “Father of the Periodic Table”• Left gaps on his periodic table for elements that
had not yet been discovered.
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Henry Moseley• 1913• Rearranged the periodic table in order of
increasing atomic number.• Called the “Father of the Modern
Periodic Table”
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And Now We Have This Beauty!
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I Bet There are Interesting Things About the Periodic Table I have to
Memorize!
• Columns (up and down) = Groups or Families
• Rows (across)= Periods
That was easy….what’s next?
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Metals, Nonmetals, and Metalloids
B
Si
Ge As
Sb Te
At
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Properties of…
Metals Nonmetals Metalloids•Solid (except Hg)•Shiny•Conduct heat & electricity•Ductile: can be stretched into wire•Malleable: can be hammered into sheets•Lose e- easily
•Opposite of metals.*Includes Hydrogen
•Brittle (break easily)•Poor conductors of heat & electricity•Tend to gain electrons in chemical reactions
•Properties a mix of metals and nonmetals.•Partially conduct electricity.
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How About Some of the Other Families?
• Alkali Metals: far left column• All soft metals that react violently with
water to make Hydrogen gas.
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• Alkaline Earth Metals: group 2• All are shiny, silvery-white, and somewhat
reactive.
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• Transition Metals: d block• Very hard with high melting and boiling
points (except Hg, of course)
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• Halogens: group 7• 7 valence electrons• Highly reactive, especially with alkali
metals and alkaline earth metals
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• Noble Gases: far right column• Full outer shells = nonreactive• All gases at room temperature