Question

What was Dibereiner's basis of classifying elements?

Answer 1

Antoine Lavoisier released a list of 33 chemical elements in 1789, categorising them as gases, metals, nonmetals, or earths. Chemists spent the next century trying to come up with a more exact categorization system. Many of the elements may be classified into triads based on their chemical characteristics, according to Johann Wolfgang Döbereiner in 1829. As soft, reactive metals, lithium, sodium, and potassium, for example, were placed together as a triad.

Complete answer:
When sorted by atomic weight, Döbereiner discovered that the second component of each triad was nearly the average of the first and third. The Law of Triads was born out of this. Döbereiner's triads were an early attempt to sort the elements into some logical order based on their physical qualities in the development of the periodic table. Johann Wolfgang Döbereiner's findings of the alkaline earths were published in a letter in 1817, stating that strontium exhibited characteristics intermediate to those of calcium and barium. By 1829, Döbereiner had discovered additional triads (groups of three elements) with comparable physical characteristics. He discovered that the characteristics of bromine, a liquid, appear to be midway between those of chlorine gas and solid iodine at the end of the decade. In two additional sequences, he remembered a similar progression of characteristics, namely calcium, strontium, barium, and sulphur, selenium, tellurium. Dobereiner's triads were made up of three components each. The components in a trio have comparable appearances and responses to one another. He demonstrated that the average of the atomic weights of the lightest and heaviest elements in each triad approached the atomic weight of the middle element. However, he was unable to support his idea with a significant number of triads, and his results were dismissed at the time as just irrational.

Note:
The periodic table is a list of chemical elements organised according to their atomic number, electron configuration, and recurrent chemical characteristics. In their most basic form, elements are given in the reading sequence in order of increasing atomic number. Then, by starting new rows and adding blank cells, rows (periods) and columns (groups) are formed to display items with repeating characteristics (called periodicity). For example, all of the elements in group (column) 18 are noble gases with little chemical reactivity.