Skip to main content

A Genius Dmitri Ivanovich Mendeleev



                       

                   DMITRI IVANOVICH MENDELEEV 



       Dmitri Ivanovich Mendeleev was born in Tobolsk (Siberia), on 8 February 1934. After his early education, he joined university due to effort of his aged mother. He received a master degree in chemistry in 1856 and doctoral degree in 1865. He was appointed professor of general chemistry in 1867, at university of St. Petersburg. In 1869 he proposed a famous “periodic law” and constructed a periodic table of elements. In this table, he placed certain elements at specific places in accordance with their properties. He also predicted properties of some undiscovered elements. 


               Mendeleev was a versatile genius. He was interested in many areas of science. He worked a lot on natural resources too. In 1890, he resigned his professorship, and appointed the director of the bureau of weight and measures. Mendeleev dedicated all his work to his mother. To name the element with atomic number 101 mendelevium was proposed to honour Mendeleev by American scientist Glenn T Seaborg, the discoverer of the element. Mendeleev died in February 1907.

Comments

Popular posts from this blog

Working of the heart

                           WORKING OF HEART   Blood from different parts of the body comes to right atrium, when it expands. Blood is brought from upper part of the body through superior vena cava and from lower part of the body through inferior vena cava.  When right atrium contracts, the blood goes to right ventricle. The atrioventricular aperture is closed by a valve after blood transfer. Valves prevent backflow of blood when the atria or ventricle contracts.    When the right ventricle contracts, blood forced out to the lungs for oxygenation through pulmonary artery, guarded by another valve. In lungs the exchange of gases takes place, blood give off carbon dioxide and takes in oxygen from lungs. Pulmonary vein brings oxygenated blood from lungs to the left atrium, as it relaxes. When the left atrium contract, the blood is transferred to left ventricle, which expands. The aperture be...

Molotov Cocktail (Petrol Bomb)

                    MOLOTOV COCKTAIL (PETROL BOMB)  INTRODUCTION Molotov cocktail is term for the simple incendiary weapon. It is also known as petrol bomb, fire bomb and benzine torch. They are relatively easy to make and may be used by irregular paramilitary forces and rioters. These bombs are also used to commit arson. These bombs are first used in Spanish civil war between July 1936 to April 1939, before they became to known as “Molotov cocktail”.  MECHANISM A Molotov cocktail consists of a glass bottle apart filled with flammable liquids. The liquid will typically be gasoline, alcohol, menthol, or ethanol. The mouth of bottle is closed with a cork or other type of tight sealing made up of glass, plastic, or rubber. A cloth rag is fixed securely around the bottle mouth. The weapon is used by first soaking the rag in flammable liquid immediately before use, lighting the rag and throw the bottle at the target....

Periodic Classification of Elements Practice Questions

THE PERIODIC CLASSIFICATION OF ELEMENTS PRACTICE QUESTIONS (CHEMISTRY)  1.What is Lavoisier classification? 2.Why Lavoisier classification failed?  3.Define law of triads.  4.Why the law of triad failed?  5.Who gave law of triads and when?  6.Define law of octaves.  7.Why the law of octave failed?  8.Who gave law of octave and when?  9.Define periodic law of Mendeleev. 10. Who gave periodic law of Mendeleev and when?  11. What is full name of Mendeleev?  12. Write some words about Mendeleev.  13. Why periodic table of Mendeleev modified?  14. Write the features of the modified version of Mendeleev periodic table.  15. Why the Mendeleev periodic table failed?  16. Who gave modern periodic table and when?  17. Define the periodic law of Moseley?  18. Write the features of modern periodic table.  19. Mendeleev periodic table was based on?  20. Modern perio...