GENERAL KNOWLEDGE

Detailed explanation-1: -Dmitri Mendeleev devised the periodic classification of the chemical elements, in which the elements were arranged in order of increasing atomic weight.

Detailed explanation-2: -In 1869, Russian chemist Dmitri Mendeleev created the framework that became the modern periodic table, leaving gaps for elements that were yet to be discovered. While arranging the elements according to their atomic weight, if he found that they did not fit into the group he would rearrange them.

Detailed explanation-3: -The periodic table was invented by Russian chemist Dmitri Mendeleev in 1869. However, prior to Mendeleev, chemists had been pondering for decades how to classify the elements. Beginning in 1789, Antoine Lavoisier began classifying elements by their properties.

Detailed explanation-4: -The periodic table was the creation of Russian chemist Dmitri Mendeleev, then a professor at St Petersburg University. In October 1867 Mendeleev began teaching the university’s large general chemistry lecture course. He quickly found himself in need of a textbook.

Detailed explanation-5: -On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing … the periodic table.