the main defect of' dobereiner's triads is that he put the chemically dissimilar elements in the same triads (dahal.ramchandra@gmail.com)
The scientist who arranged the elements into triads was Dobereiner.
The two most common triads are the Major and the minor triad. The other two types of triads are diminished and augmented triads.
a note
Johann Wolfgang Dobereiner,a German chemist arranged atom in the form of triads in 1817.
A classical accompaniment style based on triads.
Polychord
Döbereiner (working after 1815) was the first which found some rules for the rational arrangement of chemical elements. He proposed in 1829 the law of triads - only five triads were discovered.
is a arrow symmetrical
a three-note chord,
No but an isosceles trapezoid is symmetrical.
Yes, it is symmetrical