Periodic Table History Dmitri Mendeleev (1869) Creates periodic table with elements listed in...
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Transcript of Periodic Table History Dmitri Mendeleev (1869) Creates periodic table with elements listed in...
Periodic Table HistoryPeriodic Table History• Dmitri Mendeleev
(1869)• Creates periodic
table with elements listed in increasing mass.
• Finds that properties repeat in the table.
[http://www.stamprussia.com/463b.jpg]
[http://web.fccj.org/~ethall/2045/ch5/pt1871.gif]
[http://www.dlt.ncssm.edu/TIGER/diagrams/periodic/MendeleevPrediction.gif]
Periodic Table HistoryPeriodic Table History
•Henry Moseley (1913) •Current periodic table which
lists in order of atomic number, from smallest to largest.
The Periodic TableThe Periodic Table
[http://www.theschemata.com/gifconventional/17table.gif]
The Periodic TableThe Periodic Table
The Periodic TableThe Periodic Table
•Periods – Each horizontal row of the periodic table.
[http://www.chem4kids.com/files/art/elem_pertable3.gif]
The Periodic TableThe Periodic Table•Groups – Each
vertical column of the periodic table, also known as families.
•Elements in a group have similar properties.
[http://www.chem4kids.com/files/art/elem_pertable3.gif]
The Periodic Table & The Periodic Table & ElectronsElectrons
•The shape of the periodic table is due to where the electrons are located in an atom.
[http://www.bpc.edu/mathscience/chemistry/images/periodic_table_of_elements.jpg]
Nothing here???
The Periodic Table & The Periodic Table & ElectronsElectrons
•“Blocks” of the periodic table represent the last type of cloud that electrons occupy.
[http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_09/FG09_17.JPG]
“S” Cloud
[http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_09/FG09_29.JPG]
“S” Cloud
“P” Clouds
The Periodic Table & The Periodic Table & ElectronsElectrons
•Electron Configurations show where electrons are located in an atom.
•Example: H is 1s1
Period #
Cloud Type
# of Electrons
The Periodic Table & The Periodic Table & ElectronsElectrons
[http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_09/FG09_28.JPG]
Example: Oxygen 1s2 2s2 2p4 (e- = 8)
[http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_09/FG09_28.JPG]
Example: Magnesium 1s2 2s2 2p6 3s2 (e- = 12)
The Periodic Table & The Periodic Table & ElectronsElectrons
•Valence Electrons are the “outside” electrons in an atom
•Highest period number = Highest energy level
The Periodic Table & The Periodic Table & ElectronsElectrons
• Or you could look at the group number…
• Silicon has 4 valence electrons
The Periodic Table & The Periodic Table & ElectronsElectrons