Question

Question:-


Explain in brief about Dobereiner 's Triads .


Note;-

Content quality answer required.
Answer must be in 60+ words and non copied.​

Answer 1

Explanation:

• German Scientist Johan Wolfgang Dobereiner Had started classification of Elements in 1817.
• He had made 3 sets of Elements known as Dobereiner's Triads.

Dobereiner's Triads:-

$\boxed{\begin{array}{c|c|c}\sf Li &\sf Ca &\sf Cl \\&&\\ \sf Na &\sf Sr &\sf Br \\&&\\ \sf K &\sf Ba &\sf I \end{array}}$

Classification:-

In each triads the average of the Atomic masses of 1st and 3rd element is equal to the atomic mass of 2nd element .

Example:-

$\sf Atomic\: mass\:of\:Calcium=40.1$

$\sf Atomic\: mass\:of\:Strocium =87.6$

$\sf Atomic\: mass\:of\:Barium=137.3$

$\sf Average\:of\:Calcium\:and\:Barium=\dfrac{40.1+137.3}{2}=\dfrac{177.4}{2}=88.7$

• It is approximately equal to Atomic mass of Strocium.