The Key to Chemistry
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• Students will learn the history of
the early attempts in the
classification of the elements.
• Students will know the scientists
involved in the arrangement of
elements in the periodic table.
• Students will identify the
parts/features of the periodic
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ac tivity .
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The Evolution of the Periodic Table
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wrote the first extensive
list of elements
containing 33 elements
metals and nonmetals
set up a table of elements
according to their relative
developed a table of atomic
introduced letters to symbolize
Johann W. Dobereiner
classified the existing
elements into group of
three’s - TRIADS
grouped the elements in a
spiral order divided by a
vertical line based on
increasing atomic weights
• arranged the known elements in order
of atomic weights and observed
similarities between the first and ninth
elements, the second and tenth
• proposed the 'Law of Octaves'
• compiled a Periodic Table of 56
elements based on the periodicity of
properties such as molar volume
when arranged in order of atomic
• arranged the elements in the
order of increasing atomic
mass (Periodic Table)
• discovered the Noble Gases.
• determined the atomic number of each
of the elements.
• modified the 'Periodic Law' to read
that the properties of the elements vary
periodically with their atomic numbers.
<<<Click me to view the periodic table
Click me to view the features
of the periodic table >>>
Use the periodic table to identify each
of the following sets of elements as
part of a group or a period of elements.
If the set does not represent a group or
a period, write none.
a. C, Si, Ge
b. Li, Be, B
c. P, As, Sb
d. O, S, Se
e. Ag, Cd, Sn
Phoenix (You and the Natural World
Series) Chemistry; Mendoza and
DIWA Companion cd (Science)
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