Question

why such are called trace elements?​

Answer 1

An element is called as trace elements when their requirement per day is below 100 mg and deficiency leads to disorders and may prove fatal. The elements belonging to this group are copper, iron, zinc, chromium, cobalt, iodine, molybdenum, and selenium. Of these, iodine is a nonmetal, while others are metals.

Answer 2

Answer:

An element is called as trace elements as when their requirement per day is below 100mg and defiency leads to disorders and may prove fatal. The elements belonging to this group are copper , iron , zinc , cobalt, iodine, etc. Of these Iodine is a non - metals while other are metals.