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Title: Development of Periodic Table
Description: This organizational chart represents the history and development of periodic table from early 1800's up to the modern periodic table of elements. This content is discussed in Principles of Chemistry to further understand basic knowledge in Chemistry class.
Description: This organizational chart represents the history and development of periodic table from early 1800's up to the modern periodic table of elements. This content is discussed in Principles of Chemistry to further understand basic knowledge in Chemistry class.
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Chem 115 PRINCIPLES OF CHEMISTRY (Lecture)
DEVELOPMENT OF PERIODIC TABLE
Early 1800’s
(1829) Johann Dobereiner developed the
Law of Triads, it stated that middle
elements in the triad had atomic weight
that was the average of other two
members of other two members
...
Nitrogen, phosphorus,
arsenic, antimony, and bismuth were
classified as another group
...
He plotted few elements to better match
their neighbors' properties in the table, he
corrected errors in the values of numerous
atomic masses, and predicted the
existence and properties of a new
elements
...
He also predicted the
future discovery of the element neon
...
He assembled the table by
transcribing a list of elements that were
arranged on a cylinder in terms of
increasing atomic weight
...
(1870) Lothar Meyer published his work
...
He also
made a remarkable discovery in the year
1880, which is the density of nitrogen
received from the atmosphere is
somewhat greater than the density of
nitrogen obtained from one of its chemical
compounds, such as ammonia
...
This discovery proved that
“the properties of the elements vary
periodically with atomic number,” instead
of atomic weight, as had previously been
claimed under periodic law
...
He also produced his own
version of the "actinides hypothesis,"
which currently forms two rows under the
periodic table of elements
...
The Modern Periodic Table of Elements
(20’s) The periodic table is consist of 118 elements
...
Figure 1
...
ck12
Title: Development of Periodic Table
Description: This organizational chart represents the history and development of periodic table from early 1800's up to the modern periodic table of elements. This content is discussed in Principles of Chemistry to further understand basic knowledge in Chemistry class.
Description: This organizational chart represents the history and development of periodic table from early 1800's up to the modern periodic table of elements. This content is discussed in Principles of Chemistry to further understand basic knowledge in Chemistry class.