Remembering Dmitri Mendeleev, creator of Periodic Table:

On his 182nd birth anniversary, we bring to you seven amazing facts about Dmitri Mendeleev and the Periodic Table:



1. Until 1863, the world was aware of only 56 known elements. The rate of scientific progress was such that every year, a new element was being discovered. It was during this time that Mendeleev came up with the idea of the Periodic Table. He published the Periodic Table in his book-- The Relation between the Properties and Atomic Weights of the Elements.

2. Mendeleev said that he arrived at the idea in his dream, where he saw all chemical elements falling into place on a table according to their chemical properties.

3. Mendeleev had found a definitive pattern following which, each element could be placed according to their atomic weight.

4. Mendeleev also noticed that elements that are similar in their chemical properties either had the same atomic weight or had a regular increase.

5. Mendeleev also found out that the magnitude of an element's atomic weight determined the character of the element just as the magnitude of the molecule determined the properties of a compound.

6. He had also predicted the qualities of the 'missing' (yet to be discovered) elements and gave them Sanskrit names.

7. The Russian Empire appointed Mendeleev as the Director of the Bureau of Weights and Measures. He introduced the Metric System to Russia.

The periodic table has seen many changes since Russian chemist Dmitri Mendeleev designed it in 1869:

The noble gases including helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn) were added to the table between 1895 and 1901. Likewise, additions have been made to the periodic table as new elements have been discovered in the last hundred years
In 1914, English physicist Henry Gwyn-Jeffries Moseley found out that each atomic nucleus can be assigned a number, according to the number of protons in that atom. This changed the way the periodic table worked. The table was redesigned according to the atomic number of elements rather than their atomic weight
Rare-earth elements, including the elements in the Lanthanide series, were included in the atomic table in the late 19th century.