The Compassionate Chemist
Dmitri Mendeleev (1834-1907)


Mendeleev discovered the periodic table in 1860s when he first started thinking about how he could organize the table, based on their physical and chemical properties. Mendeleev was a Russian chemist who happened to be studying in Europe at the time. He met a friend named Cannizzaro from whom he obtained measurements of atomic weights and a familiarity with the ideas of Avogadro. After returning to Russia Mendeleev began searching for a logical way to organize the elements. Mendeleev used his observations to make a table that reflected this pattern.  At the time his original table was published, there was only 69 of the 112 chemical elements known today.

This is a picture of  Mendeleev`s period table. As you can see he didn`t know every element or mass at the time (known as the ?s). This was one of the first examples of the periodic table.

Mendeleev took notes over the table and things that other scientists helped him with. Many other scientists worked with Mendeleev to categorize the table and discover new elements.

This picture is a book of Mendeleev`s notes. He wrote notes in this book, the elements and his thoughts for figuring the periodic table out. It took Mendeleev a lot of notes to get everything he needed to know how to classify the mass and elements.

This picture is a finished product of the periodic table today. All of the elements are assembled and in the order. This table took a lot of thinking, but, without Mendeleev and his scientist friends we wouldn`t have this table today.

Periodic Table Facts

Mendeleev arranged 63 elements according in their weights, which he published the Principles of Chemistry. He worked with many different scientists to organize and create the periodic table. Mendeleev hypothesized that the atomic weights for these two elements had been incorrectly determined. He happened to be incorrect in this assumption, and it was not until Henry Moseley discovered atomic numbers in 1914 that the real explanation for inversion was found. Mendeleev had a lot of confidence in the existence of the law of periodicity of the elements. Mendeleev was impressed by the regularities in elements. Mendeleev was very strict about the atomic weight order and he left space for many new elements that later was discovered like the Noble gases. Mendeleev`s table didn`t receive very much recognition until, gallium, scandium, and germanium were discovered. He later discovered the metals, non-metals, alkaline metals, transition metals etc.The periodic table was published in 1869 and was presented to the Russian Chemical Society but, other scientists discovered new things about the table and added new things to it after Mendeleev`s death..

Random Facts

Mendeleev's name will forever be associated was his development of the periodic law. In 1861 Mendeleev resumed teaching chemistry at the University of St. Petersburg, the College of Engineering, and the Transport Institute and later got his degree in Chemistry of 1865. He wrote Organic Chemistry, Russia's first university manual on the subject. Two years later Mendeleev had an unhappy marriage with Feozva Nikitichna Leshcheva from 1863-1876. It lasted until 1876, when he met the young art student Anna Ivanovna Popov, whom he married illegally. He had 2 wives at the time but, only claimed one. Mendeleev saw in science a valuable tool for remaking  and modernizing Russia. Later Mendeleev died on January 20, 1907.


*Source Citation  (MLA 7th Edition)

"Mendeleev, Dmitry (1834-1907)." World of Earth Science. Ed. K. Lee Lerner and Brenda Wilmoth Lerner. Vol. 2. Detroit: Gale, 2003. 366-367. Gale Virtual Reference Library. Web. 10 Oct. 2014.

Document URL

Gale Document Number: GALE|CX3437800380

*Source Citation  (MLA 7th Edition)

"Dmitrii Ivanovich Mendeleev." Encyclopedia of World Biography. Detroit: Gale, 1998. Student Resources in Context. Web. 10 Oct. 2014.

Document URL

Gale Document Number:  GALE|K1631004477

*Source Citation  (MLA 7th Edition)

"Dmitry Ivanovich Mendeleev." World of Scientific Discovery. Gale, 2006. Science In Context. Web. 10 Oct. 2014.

Document URL

Gale Document Number:  GALE|K1648000454

8Source Citation  (MLA 7th Edition)

"Mendeleev, Dmitry Ivanovich." Complete Dictionary of Scientific Biography. Vol. 9. Detroit: Charles Scribner's Sons, 2008. 286-295. Gale Virtual Reference Library. Web. 10 Oct. 2014.

Document URL

Gale Document Number: GALE|CX2830902907

By: Lindsay Klasek, Jacob Powers

Comment Stream