Question

The concept of grouping elements into trids was given by

Answer 1

Question

The concept of grouping elements into triads was given by_______.

Answer

The concept of grouping elements into triads was given by J.W.Dobereiner in 1817.

More about the topic

J.W. Dobereiner*, in 1817, attempted to classify elements in triad. A triad is a group of three elements arranged in the order of increasing atomic masses, such that the elements in the group have similar chemical and physical properties

Dobereiner's law of triads

Dobereiner's law of triadsIt states that the atomic mass of the middle element of a triad is almost the arithmetic mean of the other two elements.

Examples

[Calcium, Strontium & boron]

Reasons for rejecting classification on the basis of triads

i) The classification into triads left room for chance. It is possible to group quite dissimilar elements in triads.

(ii) Quite a large number of elements cannot be grouped into triads.

Answer 2

Johann Dobereiner

In 1829, a German chemist, Johann Dobereiner (1780–1849), placed various groups of three elements into groups called triads. One such triad was lithium, sodium, and potassium. Triads were based on both physical as well as chemical properties.

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