Chapter 12 The Periodic Table - Materialteknologi

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Mendeleev’s s Table• Grouped elements in columns by similarproperties in order of increasing atomicmass.• Found some inconsistencies - felt thatthe properties were more important thanthe mass, so switched order.• Found some gaps.• Must be undiscovered elements.• Predicted their properties before theywere found.
The modern table• Elements are still grouped by properties.• Similar properties are in the samecolumn.• Order is in increasing atomic number.• Added a column of elements Mendeleevdidn’t t know about.• The noble gases weren’t t found becausethey didn’t t react with anything.
Page 2 and 3: History• Russian scientist Dmitri
Page 6 and 7: The Periodic TableGroup orfamilyPer
Page 8 and 9: • Elements are placed in columns
Page 10 and 11: The group B are called thetransitio
Page 12 and 13: Alkali Metals• Very reactive• N
Page 14 and 15: • Group 7A is called the Halogens
Page 16 and 17: Noble Gases• Do not react• Will
Page 18 and 19: Metals
Page 20 and 21: Examples of MetalsPotassium, Kreact
Page 22 and 23: Properties of Nonmetals…Carbon, t
Page 24 and 25: Metalloids or Semimetals• Propert
Page 26: Silicon, Si - A MetalloidOther meta

Chapter 12 The Periodic Table - Materialteknologi

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