Question

What is a triad plz explain it fast

Answer 1

it was Dobernier, a German chemist who gave the theory of triads.
he grouped the elements in three in such a way that the middle element of the triad has both atomic mass and properties roughly equal to the average of the other two elements of the triad.

example:
Li(7), Na(23), K(39). : (7+39)/2=23

Answer 2

triad is a group of three elements
Li Na K