What are the merits of dobereiner's triads?

Answer 1

In 1817, a German chemist, Johann Wolfgang Dobereiner tried to arrange the elements with same properties into groups. He found out that some groups had only 3 elements and called them 'Triads'. He showed that when the 3 elements were written in their order of increasing atomic masses……the Atomic Mass of the middle element was roughly* the average of the masses of the other two elements.

For example:

Li Na K

6.9 23.0 39.0

Average of Li & K = 22.95, i.e., *roughly 23.0

But since all the elements known then also couldn't be classified as this......'Dobereiner's Triads', as the table is known……wasn't useful……but the attempts of Dobereiner encouraged other chemists to correlate the properties of elements with their atomic masses.



Sidz

Answer 2

Of course, three elements (the Greek prefix tri has the significance three).

Some Dobereiner's triads:

Cl, Br, I

Ca, Sr,Ba

Li,Na,K

S, Se, Te

Answer 3

The only of merit Dobereiner's research was that it made chemists look at elements in terms of groups of elements with similar chemical and physical properties. This eventually led to rigorous classification of elements and the modern Periodic Table of elements, as we now know it, was discovered.

Answer 4

After the acceptance of atomic mass values universally attempts were made to find out relations between properties of the various elements and their atomic masses in 1829 j.w Dobereiner discovered that within group of elements of three closely related in chemical properties the atomic masses are either nearly the same (eg,Iron,cobalt and nickel) or the atomic mass of the middle element is approximately the arithmetic mean of other two elements. these are called Dobereiner's triads,

Answer 5

Examples:

Li, Na, K

C, N, O

Ca, Sr, Ba

Cl, Br, I

S, Se, Te

Mn, Cr, Fe

Answer 6

Dobereiner's Triads refers to an early arrangement of elements in which J.W. Dobereiner arranged them by their atomic mass in groups of three.

Answer 7

Dobereiner's triads are:

- Li, Na, K

- Ca, Sr, Ba

- Cl, Br, I

- S, Se, Te

- C, N, O