The Periodic Table of Elements (Listed by Atomic Numbers) 26th June 2019

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Atomic Numbers-The Periodic Table of Elements (Listed by Atomic
Numbers)
26th June 2019
What are Periodic Table Atomic Numbers?
The Periodic Table can be considered as one of the most essential scientific
documents which is developed in the form of a single table. It contains every kind of
information related to chemical knowledge that human beings have imbibed since centuries.
There are in total 118 elements in the table that are arranged in terms of their atomic numbers
and also according to the number of free electrons that are grouped according to the
resemblances in their chemical properties. We can say that all the matter that we observe in
the universe are created by building blocks which are known as elements. The distinction
between all these elements is possible with the help of atomic number. Each and every
element has a unique atomic number that makes it possible to distinguish between several
elements. An atom is made up of protons, electrons and neutrons. Atomic number can be
considered as a fundamental property of an atom. Each atom has a unique and distinct atomic
number. The atomic number of an atom is denoted by the letter ‘Z’. The atomic number of a
typical atom is represented by the total number of protons that make up the nucleus of the
atom. We may say that each atom of a particular element has the same number of protons and
therefore, they possess exactly the same atomic number. Likewise, atoms belonging to
diverse elements have specific atomic numbers that vary between all the elements. An atom
of an element is electrically neutral because the number of protons and electrons within an
atom are identical which makes the atom neutral electrically.

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“Atomic Number = No. of Protons = No. of Electrons”
History of the Periodic Table
The history of the periodic table dates back to centuries. There have been quite a
number of iterations in the table before the final one that we use today has been developed.
The first version of the periodic table was an attempt made by Antoine Lavoisier in the year
1789 where he published a list containing 33 chemical elements. These elements were
grouped into categories of earth, metals, non-metals and gases. Then, it was in the year 1829
that Johann Wolfgang tried to make some amendments to this table by undertaking an
approach where he tried to observe the resemblances existing in the chemical properties of
the triads of elements and then grouped them which gave rise to the Law of Triads. A number
of revisions were made by the chemists to the periodic table yet, the current groupings of the
elements was not achieved. Furthermore it was in the year 1862 that Alexandre-Émile
Béguyer de Chancourtois came up with a helix format of the periodic table. In this format the
elements have been arranged in the form of a spiral on a cylinder and it was an attempt to
indicate the periodicity in the properties of the elements for the first time. It is interesting to
learn that Chancourtois indexed the elements in the table by enhancing the atomic weight and
demonstrating that identical chemical properties were being reflected at regular intervals.
But, unfortunately his work did not receive adequate critical acclaim around the world. But,
the globally accepted periodic table that we now know of was developed by Dmitri
Mendeleev, a Russian scientist in the year 1871. The globally accepted periodic table that we
consult today is composed of eight columns, each one consisting of elements with identical
properties. The columns are numbered from I to VIII and contains empty spaces for including
undiscovered elements. Mendeleev’s prediction was right as more and more elements were
being discovered by chemists that kept on filling the gaps in the periodic table.