In which year did AEB de Chancourtois organize the elements by atomic weight, by graphing the elements around a cylinder with a circumference of 16 units, corresponding to the weight of oxygen (O)?

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SSC CGL 2022 Tier-I Official Paper (Held On : 12 Dec 2022 Shift 2)

Answer 1

The correct answer is 1862.

Key Points:

AEB de Chancourtois organized the elements by atomic weight and graphed them around a cylinder with a circumference of 16 units in the year 1862.

Alexandre-Émile-Béguyer de Chancourtois

The French geologist Alexandre-Émile Béguyer de Chancourtois was the first person to organize chemical elements by atomic weights.
In 1862, he prepared an early form of the periodic table, which he named Vis telluric (the 'telluric helix').
He plotted a graph of the elements around a cylinder with a circumference of 16 units corresponding to the weight of oxygen (O).

Additional Information:John Newlands

John Newland, an English scientist, classified the elements known at that time in ascending order of their atomic mass.
At the time of Newland, the number of known elements was 56.
He started the classification with the element hydrogen with the lowest atomic mass and ended the classification with thorium.
He found that every eighth element has the same properties as the first element.
He compared this classification to the octave of music and named it "The Law of Octaves".
Newland's classification is known as "Newlands' Law of Octaves".

Dmitri Mendeleev

Demitri Ivanovich Mendeleev (8 February 1834 – 2 February 1907), was a Russian chemist and inventor.
He proposed the periodic classification of elements.
Mendeleev's classification of elements is called "Mendeleev's Periodic Table".
Using this table, he also found out the properties of those elements which he could not discover till time.

Johann Dobereiner

In 1817, Johann Wolfgang Dobereiner, a German scientist, identified some groups of three elements with similar properties.
The triad of groups of three elements is known as Dobereiner's triad.
Wolfgang Dobereiner stated that the atomic mass of the middle element is approximately equal to the average of the atomic mass of the other two elements by placing the three elements of the triad in increasing order of their atomic mass.