distinguish (an element or atom) by using a radioactive isotope or an isotope of unusual mass for tracing through chemical reactions
What is a "label"?
A label is a piece of material or paper that is attached to a product, providing information about its brand, size, fabric, care instructions, and other important details. It is typically sewn, glued, or affixed to a garment or product, and it can be made from various materials, such as fabric, paper, or plastic. Labels are essential components of the fashion industry, as they help consumers identify and differentiate between different brands and products. They can also serve as a marketing tool, as they can feature a brand's logo or slogan, and help to create brand recognition and loyalty. In addition to providing practical information, labels can also be decorative, featuring intricate designs or patterns that add to the aesthetic appeal of the product.
a radioactive isotope that is used in a compound in order to trace the mechanism of a chemical reaction