Dmitri Mendeleev was a Russian chemist known as the father of the periodic table. He arranged the elements in order of atomic mass, leaving spaces for undiscovered elements. Mendeleev's periodic law states that physical and chemical properties are periodic functions of atomic mass. His predictions about undiscovered elements were later proven correct. Mendeleev published seminal chemistry textbooks and worked to introduce the metric system in Russia. He received honors including the Davy Medal and Copley Medal for his groundbreaking work establishing the periodic table.

1. DIMITRI MENDELEEV
FATHER OF PERIODIC TABLE
Presented by
ASHA A. M.

2. DMITRI IVANOVICH MENDELEEV
(1834 – 1907)
• Russian chemist
• Known as Father of Periodic table
•Born in Tobolsk, Siberia
• Studied and completed masters at St. Petersburg
• Appointed to professorship and later to the chair in the university
• He was a great teacher of his time

3. BOOKS
• The definitive two volume textbook “
Principles of Chemistry “,(1868- 1870)
• “ Organic chemistry” ,1861

4. MAJOR CONTRIBUTIONS
• Created first model of periodic table and postulated “ Periodic Law “.
• Studied in the elasticity of gases
• Studied the heat expansion of liquids and proposed a formula similar
to Gay Lussac’s law of uniformity of expansion of gases.
• Worked for first oil refinery and to transform petrol industry in
Russia.
• Invented pyrocolloidon,based on nitrocellulose to replace
gunpowder.

5. CONTD...
• Studieson determining the nature of solutions.
• Discussed Theory of hydration in the monograph “ Study of aqueous
solution from their Specific Gravity”.
• Defined critical temperature of gases as, ‘ The temperature at which
cohesion and heat of vaporization become equal to zero and liquid
changes to vapour irrespective of pressure and volume.
• Introduced metric system in Russia.

6. WORKS ON PERIODIC TABLE
• Set out to identify the pattern in the elements.
• Mendeleev wrote facts about the elements on individual paper cards.
• Arranged 63 elements in the order of their atomic mass.
• Found out that some elements have similar chemical and physical
properties.

8. CONTD...
• Mendeleev’s periodic law states that “ the physical and
chemical properties of elements are periodic functions
of their Atomic masses.”
• Each element showed properties similar to elements
above and below it.
• Pointed out that some atomic weights had been
measured incorrectly. ( Eg., At. Mass of Beryllium was
redetermined from 14 to 9)

9. • He left three blank spaces and predicted the properties of the yet undiscovered
elements. Later found that his predictions hold good with their properties.
??
Eka boron
44
??
Eka
aluminium
68
??
Eka silicon
72
Scandium
Discovered
in 1879
Germanium
Discovered
in 1886
Gallium
Discovered
in 1875

10. AWARDS
• Davy medal from Royal Society of England in 1882.
• Domindov prize for his book “ Organic Chemistry”.
• Copley medal from the Royal Society of England in 1905.

11. HONOURS
• Director of the Bureau of Weights and Measures (1893)
• Member of Royal Swedish Academy of Sciences (1905)
• The crater “Mendeleev” on the moon.
Coins to memorize Mendeleev
150 year anniversary

12. • The element with atomic number 101 is
named after him as “Mendeleevium” (Md).
• The D.I. Mendeleev All Russian Institute of
Metrology ( VNIIM ), one of the largest world
centre of scientific and practical Metrology is
named after him.
CONTD...

13. Monument to Mendeleev in St Petersburg
Russia
Dmitry Mendeleev sculpture in
Bratislava Slovakia

15. REFERENCE
• The Periodic Table Book- A visual encyclopaedia of the
elements; Tom Jackson
• NCERT Plus One chemistry text book
• SCERT Std.9th Chemistry text book
• The New Encyclopaedia Britannica, Volume 8