Dmitri Ivanovich Mendeleev (also romanized Mendeleyev or Mendeleef; Russian: Дми́трий Ива́нович Менделе́ев listen (help·info)) (8 February [O.S. 27 January] 1834 – 2 February [O.S. 20 January] 1907) was a Russian chemist and inventor. He is credited as being the creator of the first version of the periodic table of elements. Using the table, he predicted the properties of elements yet to be discovered.
- I wish to establish some sort of system not guided by chance but by some sort of definite and exact principle.
- Declared in his treatise “An Outline of the System of the Elements” it was read to the Russian Chemical Society.
In this famous paper, Mendeleyev predicted:
- We should still expect to discover many unknown simple bodies; for example, those similar to aluminum and silicon, elements with atomic weights of 65 to 75.
Mendeleev left blank spaces for 16 new elements. When asked for proof for his predictions, he replied:
- I have no need of proof. The laws of nature, unlike the laws of grammar, admit of no exception.
- I suppose when my unknown elements are found, more people will pay us attention.
- Source: article Peering Into the Unseen—What Is Revealed? in Awake! magazine, August 22, 2000.
Quotes about Mendeleev
- Even though Mendeleev always denied that electrons exist, they later turned out to be vital for ordering the elements in his table.
- Patricia Fara, Science A Four Thousand Year History (2009)