Question

Which of the following is not a trace element?
(A)Zn
(B)Mn
(C)Mg
(D)Cu

Answer 1

The element which is not included in the trace elements has the atomic number 12. It is found to be a shiny gray solid which bears a close physical resemblance to the other five elements in the second column of the periodic table.

Complete step by step answer:
Mg is not a trace element. An element is absorbed by the plants in a small amount is termed as a trace element which is important for the correct growth, development, and physiology of the plants. Chromium, cobalt, copper, iron, manganese, magnesium, molybdenum, selenium, zinc all are the instances of trace elements. Magnesium (Mg) is a macronutrient.

So, the correct answer is ‘Mg’.

Additional Information: Trace elements are commonly known as the micronutrient, and defined as any element required by living organisms in minute amounts (that is a smaller amount than 0.1 percent by volume, usually as a part of an important enzyme. The correct amount of requirement varies among species, but the commonly required plant trace elements will include the copper, boron, zinc, manganese, and molybdenum. Animals also require manganese, iodine, and cobalt. Lack of necessary plant trace elements within the soil causes deficiency diseases; lack of animal trace elements within the soil might not harm plants, but, without them, animals which are totally feeding on those plants develop their own deficiency diseases.
The term trace element is commonly used in geology, where it's used to describe the elements apart from oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium that occur in minuscule concentrations in rocks—that is, in concentrations of but 0.1 percent by weight.

Note:
The important interaction between phosphate and magnesium ions makes magnesium essential to the fundamental nucleic acid chemistry of all cells of all known living organisms. Over approx 250 enzymes have the requirement of magnesium ions for their catalytic action, including all enzymes using or synthesizing ATP and those that use other nucleotides to synthesize DNA and RNA.