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Notes 2 The Periodic Table

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Notes 2 The Periodic Table Sci 10 Chiemistry Mendele ev created the modern periodic table of the elements, placing the elements in order of ascending atomic mass. – PowerPoint PPT presentation

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Title: Notes 2 The Periodic Table


1
Notes 2 The Periodic Table
  • Sci 10
  • Chiemistry

2
  • Mendeleïev created the modern periodic table of
    the elements, placing the elements in order of
    ascending atomic mass.

3
  • Columns (vertical) of the periodic table are
    called GROUPS
  • Elements in a group share characteristics and
    properties
  • Rows (horizontal) of the periodic table are
    called PERIODS
  • Elements in a period all have the same electron
    shell(s)

4
Métalloides
5
  • Metals and non-metals have different properties.
  • Metalloids have properties of metals and
    non-metals.

6
Alkaline Metals Group I
7
Alkaline Earth Metals Group II
8
Transition Metals (metals with more than one
charge)
9
Halogens Group VII (or XVII)
10
Noble Gases Group VIII (or XVIII)
11
Hydrogen an exception
  • It can behave like an alkaline metal or like a
    halogen

12
Back to electrons
  • Electrons are located on shells around the
    nucleus
  • Different shells contain different number of
    electrons
  • Different elements have different numbers of
    shells
  • Valence shells shell the farthest away from
    nucleus
  • Valence electrons electrons on the valence
    shell

13
  • Period indicates the of electron shells
  • Period 1 1 shell (2 e- max)
  • Period 2 2 shells 
  • shell 1 - 2 e- max
  • Valence shell (shell 2) 8 e- max
  • Period 3 3 shells 
  • shell 1 - 2 e- max
  • shell 2 8 e- max
  • Valence shell (shell 3) 8 e- max

14
Bohr-Rutherford Diagram/ Electron shell diagram
  • An atomic model that shows the distribution of
    ALL electrons
  • Indicate the of p and of neutrons in nucleus
    (drawn as a circle)
  • Determine of shells ( of period)
  • Add electrons (max 2 for the 1st, 8 for la 2nd
    and 3rd)

15
  • Group represents the of valence electrons

16
Lewis Structures/ Electron Dot Diagrams
  • A method of representing an atom that shows only
    its valence electrons
  • sodium carbon
  • chlorine

17
Practice!
  • Notes 2 - Questions
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