Döbereiner and Newland’s classification of elements

A Powerpoint made for my school on Döbereiner and Newland’s classification of elements describing and explaining the different patterns and structures in which the Elements were arranged before we encountered the Periodic Table of Elements as we know them today.

Also a Fun Fact:
The 4 newest elements on the periodic table have just been named:
-Nihonium and symbol Nh, for the element with Z =113,
-Moscovium with the symbol Mc, for the element with Z = 115,
-Tennessine with the symbol Ts, for the element with Z = 117,
-Oganesson with the symbol Og, for the element with Z = 118.

1. Döbereiner & Newland’s Classification of Elements Afrah Aamer | Delhi Public School | X-B

2. Johann Wolfgang Döbereiner In work beginning in 1829, Döbereiner discovered trends in certain properties of selected groups of elements. For example, the average atomic mass of lithium and potassium. Moreover , the densities for some of these triads followed a similar pattern. These sets of elements became known as "Dobereiner's Triads".

3. Döbereiner Triads In 1817, Johann Wolfgang Döbereiner began to formulate one of the earliest attempts to classify the elements. In 1829, he found that he could form some of the elements into groups of three, with the members of each group having related properties. He termed these groups triads. Some of the triads that were classified by Döbereiner are: C hlorine , Bromine , & I odine C alcium , Strontium , & B arium Nitrogen, Phosphorus, &Arsenic L ithium , Sodium , & P otassium In all of the triads, the atomic weight of the middle element was almost exactly the average of the atomic weights of the other two elements. Cl Ca N Li Br Sr P Na I Ba As K

4. John Alexander Reina Newlands Newlands was the first person to devise a periodic table of elements arranged in order of their relative atomic weights. Continuing Johann Wolfgang Dobereiner's work with triads and Jean-Baptiste Dumas' families of similar elements, he published in 1865 his 'Law of octaves', which stated that "any given element will exhibit analogous behavior to the eighth element following it in the table."

5. Newlands’ Law of Octaves If the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements. Newlands was one of the first to detect a periodic pattern in the properties of the elements and anticipated later developments of the periodic law. sa (do) re (re) ga (mi) ma (fa) pa (so) da (la) ni ( ti ) H Li Be B C N O F Na Mg Al Si P S Cl K Ca Cr Ti Mn Fe Co & Ni Cu Zn Y In As Se Br Rb Sr Ce & La Zr -- --