微元素英文係咩??

微元素英文係: trace element
General explaination: needed only in extermely small amounts (esp in the soil, for the proper growth substances)

In analytical chemistry,a trace element is an element in a sample that has an average concentration of less than 100 parts per million atoms, or less than 100 micrograms per gram.

In biochemistry, a trace element is a chemical element that is needed in minute quantities for the proper growth, development, and physiology of the organism. In biochemistry, a trace element is also referred to as a micronutrient.

In geochemistry, a trace element is a chemical element whose concentration is less than 1000 ppm or 0.1% of a rock's composition.

The term is used mainly in igneous petrology.

microelement

trace element

microelement