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Periodic Table Notes

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Periodic Table Notes Periodic Table An arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same ... – PowerPoint PPT presentation

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Title: Periodic Table Notes


1
Periodic Table Notes
2
  • Periodic Table
  • An arrangement of the elements in order of their
    atomic numbers so that elements with similar
    properties fall in the same column or group.

3
6 C Carbon 12.011
Atomic Number Atomic Symbol Name Atomic Mass
4
  • Atomic Radius
  • One half the distance between the nuclei of
    identical atoms that are bonded together.
  • Trend
  • Increases as you go down the groups
  • Decreases as you go across the periods

5
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Trends Sample 1
  • Of the elements magnesium, Mg, chlorine, Cl,
    sodium, Na, and phosphorus, P, which has the
    largest atomic radius? Which has the smallest?

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  • 1. Find atoms on the periodic table
  • 2. Compare to trend
  • Decreases as you go across the period
  • Largest atomic radius Sodium, Na
  • Smallest atomic radius Chlorine, Cl

8
Trends Sample 2
  • Of the elements calcium, Ca, beryllium, Be,
    barium, Ba, and strontium, Sr, which has the
    largest atomic radius? Which has the smallest?

9
  • 1. Find atoms on the periodic table
  • 2. Compare to trend
  • Increases as you go down the groups
  • Largest atomic radius Barium, Ba
  • Smallest atomic radius Beryllium, Be

10
  • Ion
  • An atom or group of bonded atoms that has a
    positive or negative charge.
  • Ionization Energy
  • The energy required to remove one electron from
    a neutral atom of an element.
  • Trend
  • Decreases as you go down the groups
  • Increases as you go across the periods

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  • Cation
  • Positively charged ion.
  • Anion
  • Negatively charged ion.
  • Valence Electrons
  • The electrons available to be lost, gained, or
    shared in the formation of chemical compounds.

13
Valence Electrons in Main Group Elements Valence Electrons in Main Group Elements Valence Electrons in Main Group Elements
Group Number Group Configuration Number of Valence Electrons
1 s1 1
2 s2 2
13 s2p1 3
14 s2p2 4
15 s2p3 5
16 s2p4 6
17 s2p5 7
18 s2p6 8
14
  • Electronegativity
  • The ability of an atom in a chemical compound to
    attract electrons.
  • Trend
  • Decreases as you go down the groups
  • Increases as you go across the periods
  • Nobel gases have no electronegativity (they do
    not want electrons)

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  • Fluorine is the most electronegative element
    (wants an electron the most) and is therefore
    assigned the highest value of four.
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