the periodic table miss fogg fall 2015. the development of the periodic table teded: the periodic...
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The Periodic TableMiss FoggFall 2015
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The Development of the Periodic Table
• TedEd: The Periodic Table• Record 3-5 things you learn…
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Periodic Table of the Elements
• Not all atoms are the same…• Different elements have different numbers of
protons
• Periodic table organizes each element into a chart
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Periodic Table of the Elements
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Periodic Table of the Elements
• Periodic table - 1869 by Dimitri Mendeleev:• A chart (chemist's road map) of elements arranged by
atomic number• Classified by the number of protons in the nucleus
• Arranged from left to right• Each having one more proton and electron than the
preceding element
© 2015 Pearson Education, Inc.
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How to read the periodic table
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How to read the periodic table
• You will need to be able to find the following information for any element:• # of protons = atomic #• # of electrons (neutral atom) = atomic #• # of neutrons = atomic weight – atomic #• # of electron shells = period # (row #)• # of valence electrons = group # (column #)
• Electrons exist within distinct electron shells/orbitals (they don’t just float around randomly)
• The valence electrons (those found on the outer most shell) are the ones that participate in reactions.
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How to Read the Periodic Table
• Even though they skip some squares in between, all of the rows go left to right. When you look at a periodic table, each of the rows is considered to be a different period (Get it? Like PERIODic table.)
•quoted from http://www.chem4kids.com/files/elem_pertable.html
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Periods = Rows
• All of the elements in a period have the same number of ELECTRON SHELLS.• The row # = # of electron shells• ie: Helium in row 1 has 1 electron shell• ie: Carbon in row 2 has 2 electron shells
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Periods = Rows• Electrons are found on distinct shells
• There can only be a certain # of electrons per shell:
Electron Orbital Rules:
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Group = column
• Elements in the same column have the same # of valence electrons
• Valence electrons = a certain # of electrons found on the outer most shell