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The Periodic Table
Chapter 6
Section 6.1
Pgs. 174-176
Section 6.1 Development of the Modern Periodic
Table
Trace the development of the periodic table.
Identify key features of the periodic table.
The History of the Periodic
Table
While Dimitri Mendeleev was studying
properties of the elements he noticed that
physical and chemical properties of elements
repeated in an orderly way when organized
according to increasing atomic masses.
He realized that these patterns can help identify
undiscovered elements and predict their
properties.
This is called periodicity.
Mendeleev’s first periodic table
Periodicity
The tendency for the properties of the
elements to repeat or recur in an orderly
way from row to row on the periodic table
at regular intervals —like the appearance
of Haley’s comet every 76 years
Henry Moseley
He arranged the periodic table according to
increasing atomic numbers.
By doing this he saw fewer irregularities
Moseley’s periodic table is what is used
today.
The Modern Periodic Table
This table was based on the Periodic Law,
which states:
that the chemical and physical
properties of the elements repeat in a
regular pattern when they are arranged
in order of increasing atomic number.
Parts to the Periodic Table
Elements with similar properties fall within
the same group or vertical column in the
periodic table. As can be called a family.
The horizontal rows of the periodic table are
called periods.
Information found on the
Periodic Table
The element’s:
Atomic number
Atomic mass
Symbol of the Element
Name of the Element
Aliens Activity
Nautilus shell has a repeating pattern.
Look carefully at the drawings of the ‘aliens’.
Organize all the aliens into a meaningful pattern.
Aliens Lab
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