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Early Periodic Table
 1700’s
about 30 elements
listed.
 Mostly metals used for
constructive purposes, with a
few non-metals.
Early Periodic Table
J. W. Dobereiner
(Early 1800’s)
formed groups of
3 called “triads”.
 Properties of the
“middle” element
are roughly the
average of the
other two

[http://www.bbc.co.uk/schools/gcsebitesize/img/gcsechem_10.gif]
Early Periodic Table
J. A. R. Newlands
(1865) organized
all the elements
by atomic mass.
 Properties
repeated every 8
atoms. (musical
octaves!)

[http://www.bbc.co.uk/schools/gcsebitesize/img/gcsechem_10.gif]
Early Periodic Table
Mendeleev (1869)
publishes 1st
“Periodic Table”
 The table is
arranged so that
elements in
columns have
similar properties.

[http://jchemed.chem.wisc.edu/Journal/Issues/2003/Aug/Images/JCE2003p847fig3.gif]
[http://web.fccj.org/~ethall/2045/ch5/pt1871.gif]
[http://www.dlt.ncssm.edu/TIGER/diagrams/periodic/MendeleevPrediction.gif]
The Mendeleev Song
Early Periodic Table
 Moseley
(early 1900’s) develops the
Periodic Law that arranges elements
by atomic number.
Early Periodic Table
 Periodic
Law – When elements
are arranged in increasing
atomic number, their physical
and chemical properties show a
periodic pattern.
Click Here for The Dynamic
Periodic Table
The Periodic Table Today
 Groups
– Each
vertical
column of the
periodic table,
also known as
families.
[http://www.chem4kids.com/files/art/elem_pertable3.gif]
The Periodic Table Today
 Periods
– This
is each
horizontal row
of the periodic
table.
[http://www.chem4kids.com/files/art/elem_pertable3.gif]
The Periodic Table Today
 Metals
– left of “zig-zag”
 Nonmetals – right of “zig-zag”
[http://www.chem.gla.ac.uk/teaching/GenChemWeb/assets/PeriodicTable/PTblMk2/PTblGroups.gif]