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Periodic Trends 1

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Some properties in the first column of the Periodic Table (alkali metals) ... Properties of some compound in Periodic Table. Microscopic Periodic Trends ... – PowerPoint PPT presentation

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Title: Periodic Trends 1


1
Periodic Trends 1
  • A periodic trend
  • Changes in physical or chemical properties,
    formulas or microscopic attributes that have some
    pattern in the Periodic Table
  • Patterns have breaks and there are exceptions
  • Going across a row or down a column
  • Big picture trends from one end to another
    end
  • Trends in macroscopic properties
  • physical properties changes in MP and BP, color,
    hardness, conductivity
  • chemical properties changes in the way in which
    elements react with other elements or compounds

2
Periodic Trends 2
  • Trends in microscopic properties
  • Measured values ionization energy, electron
    affinity, atomic size, ionic size
  • Derived values effective nuclear charge,
    electronegativity
  • Trends in formulas
  • Formulas are a consequence of how matter is
    organized on the microscopic level
  • Changes in formulas suggest going from one type
    of organization to another

3
Melting Points of Oxides
4
Melting Point of the Hydrides
5
Melting Points of Sulfides
6
Melting Points of Chlorides
7
Some properties of element in the first full row
of the PT
8
Some properties of element in the second full row
of the PT
9
Some properties in the first column of the
Periodic Table (alkali metals)
10
Some properties in the second column of the
Periodic Table (alkaline earth metals)
11
Some properties in the 17th column of the
Periodic Table (halogens)
12
Chemical and Physical Properties of some compound
in Periodic Table
13
Microscopic Periodic Trends
  • Ionization energy
  • How much energy does it take to remove an
    electron from the nucleus it is associated with
  • The easiest electron to remove is furthest from
    nucleus
  • Atomic size ionic size
  • How big are atoms and ions
  • What is the distance from the center of the
    nucleus to the outermost electron
  • Effective nuclear charge
  • What nuclear charge is felt as we go further
    away from nucleus
  • Electronegativity
  • What is the relative tendency of elements to hold
    their own electrons and to compete for the
    electrons of other elements
  • Need to know where electrons are located
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