johann wolfgang dobereiner organized known elements by placing them into groups of three called triads.
johann wolfgang dobereiner organized known elements by placing them into groups of three called triads.
who organized known elements by placing them into groups of three called triads?
johann wolfgang dobereiner
Na
Na
definition of triad law:-"chemically analogous elements arranged in increasing order of their atomic weights formed well marked groups of three called triads in which the atomic weight of the middle element was found to be generally the arithmetic mean of the atomic weight of the other two elements in the triad.









































bullet::::1. chlorine, bromine, and iodine









































bullet::::2. calcium, strontium, and barium









































bullet::::3. sulfur, selenium, and tellurium









































bullet::::4. lithium, sodium, and potassium
history of the periodic table