• Born 27 January 1834 - Tobolsk, Russia
  • Deceased 20 January 1907 - Sankt-Peterburg, Russia , age at death: 72 years old
  • Scientist

 Parents

 Siblings

 Notes

Individual Note

On March 6, 1869, Mendeleev made a formal presentation to the Russian Chemical Society, entitled The Dependence between the Properties of the Atomic Weights of the Elements, which described elements according to both weight and valence. This presentation stated that

The elements, if arranged according to their atomic mass, exhibit an apparent periodicity of properties. Elements which are similar as regards to their chemical properties have atomic weights which are either of nearly the same value (e.g., Pt, Ir, Os) or which increase regularly (e.g., K, Rb, Cs). The arrangement of the elements in groups of elements in the order of their atomic weights corresponds to their so-called valencies, as well as, to some extent, to their distinctive chemical properties; as is apparent among other series in that of Li, Be, B, C, N, O, and F. The elements which are the most widely diffused have small atomic weights. The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a compound body. We must expect the discovery of many yet unknown elements–for example, two elements, analogous to aluminium and silicon, whose atomic weights would be between 65 and 75. The atomic weight of an element may sometimes be amended by a knowledge of those of its contiguous elements. Thus the atomic weight of tellurium must lie between 123 and 126, and cannot be 128. Here Mendeleev was wrong as the atomic mass of tellurium (127.6) remains higher than that of iodine (126.9). Certain characteristic properties of elements can be foretold from their atomic weights.

 Family Tree Preview

             
     
     
     
Pavel Maximovich SOKOLOV   ? ?    
|
4
  |
5
 



 
|  
Ivan Pavlovich MENDELEYEV   Maria Dmitrievna KORNILIEVA
|
2
  |
3



|
Dmitry Ivanovich MENDELEYEV 1834-1907


  1. Discover the new Geneanet family tree software

    Discover the new Geneanet family tree software and menus.

    If you don't want to take the tour now, you can always take it later by clicking 'Tour' at the bottom of the screen.

  2. Geneanet Home Page (1/7)

    Click here to go back to the Geneanet home page.

  3. Profile, Messages and Email Alerts (2/7)

    Click here to edit your profile, to read your messages, to edit your Email Alerts, and to log out from Geneanet.

  4. Sign In/Sign Up (2/7)

    You are not logged in to Geneanet.

  5. Family Tree Home Page (3/7)

    Click here to go back to the family tree home page.

  6. Search (4/7)

    Enter a name to make a search in this family tree.

    Pass your mouse over these fields to get access to adanced search options.

  7. Menu (5/7)

    This menu provides tools and options which were formerly available in the left sidebar: personal notes, archival documents and pictures, map, family book, GEDCOM upload, export, etc.

  8. Access Rights (6/7)

    - 'Visitor' can browse family tree but they can't view private data.
    - 'Guest' can browse family tree including private data.
    - 'Admin' can browse and edit family tree.

  9. High Contrast (7/7)

    Turn on High Contrast to make family tree easier to read.

  10. That's All!

    Click the 'Tour' link at the bottom of the screen to take the tour again.