this ppt is about the modern periodic table. In this, I have written about who made the periodic table

1. CREATION OF
THE MODERN
PERIODIC TABLE
P R E S E N TAT I O N B Y
A R YA M A N S I N G H C L A S S 9

2. INTRODUCTION
• The periodic table is the tabular arrangement of all the
chemical elements on the basis of their respective atomic
numbers
• THERE ARE FEW ELEMENTS LIKE:-
• Alkali metals
• Lanthanides
• Actinides
• Unknown properties
• Reactive non-metals
• NOBLE GASES
• Alkaline earth metals
• Transition metals
• Post-transition metals
• Metalloids
• The modern periodic table

3. Scientists Involved In The Creation Of Periodic Table
Johann Wolfgang
Deöbreiner
German chemist
John Newlands
British chemist
Dmitri Mendeleev
Russian chemist

4. Johann Wolfgang Döbereiner
• Johann Wolfgang Döbereiner (13 December 1780 – 24 March 1849) was a German chemist who
is best known for work that foreshadowed the periodic table for the chemical elements, and for
inventing the first ligther, which was known as the doberreiner lamp. He became a professor of
chemistry and pharmacy at the UNIVERSITY of jena.During the 1820s Döbereiner’s experiments
with the ignition of hydrogen on contact with powdered platinum led the Swedish chemist J.J.
Berzelius to develop the concept of catalysis. Toward the end of the decade Döbereiner found that
the properties of bromine, aiquid, seem halfway between those of chlorine gas and the solid iodine.
He recalled a comparable graduation of properties in two other sequences—calcium, strontium,
barium; and sulfur, selenium, tellurium. He showed that in each triad the mean of the lightest and
heaviest atomic weights approximated the atomic weight of the middle element. But he could
not substaniate his hypothesis with a sufficient number of triads, and his findings were regarded
in his time as merely interesting curiosities. Döbereiner also discovered the organic compound
furfural and developed the separation of calcium and magnesium.

5. Johann Wolfgang Döbereiner's
Periodic table

6. John Newland
• John Newlands, in full John Alexander Reina
Newlands, (born November 26, 1837, London,
England—died July 29, 1898, London), English
chemist whose “law of octaves” noted a pattern in
the atomic structure of elements with similar
chemical properties and contributed in a significant
way to the development of the periodic law.
• In 1864 he published his concept of the periodicity
of the chemical elements, which he had arranged in
order of atomic weight. He pointed out that every
eighth element in this grouping shared a
resemblance and suggested an analogy with the
intervals of the musical scale. The “law of octaves,”
thus enunciated, was controversial at first but later
was recognized as an important generalization in
modern chemical theory. Newlands collected his
various papers in On the Discovery of the Periodic
Law (1884).

7. Dmitri Mendeleev
• Dmitri Mendeleev, Russian in full Dmitry Ivanovich
Mendeleyev, (born January 27 (February 8, New Style),
1834, Tobolsk, Siberia, Russian Empire—died January 20
(February 2), 1907, St. Petersburg, Russia), Russian
chemist who developed the periodic classification of the
elements
• In 1869, Russian chemist Dmitri Mendeleev created the
framework that became the modern periodic table, leaving
gaps for elements that were yet to be discovered. While
arranging the elements according to their atomic weight, if
he found that they did not fit into the group he would
rearrange them. Mendeleev predicted the properties of
some undiscovered elements and gave them names such
as "eka-aluminium" for an element with properties similar to
aluminium. Later, ‘eka-aluminium’ was discovered as
gallium. Some discrepancies remained; the position of
certain elements, such as iodine and tellurium, could not be
explained.

8. Modern periodic table
Antonie lavoiser
French chemist
Lothar meyer
German chemist
Henry Moseley
English chemist

9. • Scientists that contributed in the creation of the present day
periodic table are French chemist, Antoine Lavoisier; German
chemist, Lothar Meyer and English physicist, Henry Moseley.
Some advantages of the modern periodic table are as follows:-
1. The table is based on a fundamental property i.e. atomic
number of the elements.
2. It correlates the position of the element with its electronic
configuration clearly.
3. The completion of each period is more logical. Across a period
as the atomic number increases the energy shells are gradually
filled up until an inert gas configuration is reached.
4. It is easy to remember and reproduce.

10. Limitations of the modern periodic table:
• Uncertainty regarding the position of hydrogen whether it should be placed in the IA
group or VIIA group.
• No place for isotopes of elements in the Modern periodic table.
• Lanthanides and Actinides are kept separately under the table not kept within the
Modern periodic table.
• The modern periodic table could not explain the cause of periodicity, or separation of
similar elements. Some dissimilar elements have been placed together.

11. Thank you
Thank you for viewing this presentation
with peace .I hope that you all have
learned something from this
presentation about the periodic table
and will respect the scientist who
invented the periodic table.
Regards,
Aryaman
singh

12. THE END