| Element
Name |
Atomic
Number |
Atomic
Weight |
Melting
Point |
Boiling
Point |
Mass
-G/cc |
For convenience due the limitations of screen width the Periodic Table above does not include the
Lanthanides (group six) or
Actinides (group seven) which reside between group 2 and group 3
of the periodic table shown above. They are however listed separately
in the chart / table below.
Facts and Info about the Periodic Table Groups
Properties within each individual group on the Periodic Table are similar, but
nevertheless vary within a group. Generally chemical activity
decreases as the period increases a non-metal group and increases
as the period increases within a metal group. The first element in
a group is always an active metal, the last is always an inactive
non-metal.
Facts and Info about the Periodic Table Periods
The period of an element signifies the highest energy level an
electron in that element occupies in an unexcited state. Generally, within a given period, the chemical activity of
metals increases with the group number , while the chemical
activity of non-metals within a given period decreases with the
group number.
History of
the Periodic Table
Dimitri Mendeleev
and Facts and Info about the first Periodic Table
Dimitri
Mendeleev, the father and inventor , of the Periodic Table,
was born on February 7, 1834 in Tobolsk, Siberia in Russia. The famous Russian Scientist perceived the correct
classification Method "the periodic table" for the 65 elements
known in his time by their atomic weights and chemical valency in
1869.
Mendeleev then went further, using the remaining gaps and spaces
in his periodic table, he correctly concluded that a group of yet
unknown elements must exist to fill in the gaps in the Periodic
Table, this was the group we now know as the lanthanides.
History, Facts and Information
about the
modern Periodic Table
Fifty years after Dimitri Mendeleev created the Periodic table, the British scientist Henry Moseley discovered that the
number of protons in the nucleus of a particular type of atom was
always the same. When atoms are arranged via their atomic number,
the few remaining problems with Mendeleev's original periodic
table disappeared. Due to Moseley's work, the modern periodic
table is based on the atomic numbers of the elements rather than
atomic mass.
Dimitri
Mendeleev's work on the periodic table recognised
Dimitri Mendeleev has clearly left his mark on modern science, all
Scientists today are familiar with his Periodic table.
Mendeleyev's homeland Russia has recognised the significance of
his work on the Periodic Table by naming the "Mendeleyev University of Chemical
Technology" in Moscow in his honour.
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