Periodic Table
What is the Periodic Table?
The periodic table is
the arrangement of all the elements known to man according to the increasing many atoms and the repetitive chemical properties. They are arranged in a
table arrangement where rows are points and columns are grouped. The elements
are arranged from left to right and top to bottom in order of their increasing
number of atoms. Therefore,
Ø
Elements in the same
group will have the same valence electron configuration and thus, similar
chemical properties.
Ø
Whereas, an element in
the same period will have an increasing arrangement of valence electrons. Thus,
as the atomic energy level increases, the number of energy sub-levels per
energy level increases.
The first 94 elements of
the periodic table occur naturally, while the rest from 95 to 118 are only
synthesized in laboratories or nuclear reactors.
The modern periodic table, which we use now, is a new and improved version of a particular model put forward by scientists in the 19th and 20th centuries. Dimitri Mendeleev presented a periodic table based on the findings of several previous scientists such as John Newlands and Antoine-Laurent de Lavoisier. However, Mendeleev was given full credit for the expansion of the periodic table.
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