the periodic table 8 th grade. 3 dmitri mendeleev discovered that patterns appeared when elements...
TRANSCRIPT
The Periodic Table
8th Grade
3
Dmitri Mendeleev
Discovered that patterns appeared when elements were arranged in order of increasing atomic mass.
He published the first periodic table.
Periodic Table
Made up of elementsArranged by similar properties
Groups or Families Vertical columns on the
table – indicate # of valance electrons...number yours now!
Elements have similar properties
Groups or Families (cont) Group 1-Alkali Metals Group 2 Alkaline Earth Metals Groups 3-12 Transition Metals Groups 13 -16 – Named by top
element in each group
Groups (cont)
Group 13-Boron Family Group 14-Carbon Family Group 15-Nitrogen Family Group 16-Oxygen Family Group 17 – Halogens Group 18 – Noble Gases
Periods Horizontal line of
elements Arranged by
number of electron energy levels
Each period has the same number of shells.
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Energy Level Example
Lithium (Period 2) – only valence electron shown
Metals, Non Metals, & Metalloids Elements separated by
zigzag line. Left of line are metals Right of line are non-metals Elements on either side of
zigzag are metalloids.
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METALSElements on the LEFT
side of the periodic table; have a shiny surface and are good conductors of electricity
13
NON METALS
Elements on the RIGHT side of the periodic table; dull and are not good conductors of electricity
14
METALLOIDS
Elements that are to the LEFT AND RIGHT of the zigzag line; have some characteristics of metal and non metal
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Periodic Table Mini Quiz...you may use your notes. Directions: Get out paper and answer the following questions.
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Answers!!! 1. Alkali metals 2. Cl, F, Br, I 3. Eight, except Helium which has only 2
valence electrons. 4. Number of valence electrons. 5. They are the same. 6. The number of shells. 7. Either side of the zigzag line on the
periodic table. 8. To separate the metals from the
nonmetals.
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