On a weight-for-weight basis, Dyneema is 15 times stronger than steel and is 40 percent stronger than aramid fibers [source: Dyneema ]. Aramid fibers are another type of synthetic material that has similar characteristics, although not all; one of the most common types of aramid fiber is Kevlar.
radioactive isotope, also called radioisotope, any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy â¦ by spontaneously emitting radiation in the form of alpha, beta, and gamma rays. Every chemical element has one or more radioactive isotopes.For example, hydrogen, the lightest element, has three isotopes with mass numbers 1, 2, and 3. Only hydrogen-3 (tritium), however, is a radioactive isotope, the other two being stable. More than 1,000 radioactive isotopes of the various elements are known. radioactive isotope is a form of an element that is unstable and eventually decays into a different element. For example, most Carbon has 6 protons and 6 neutrons, and is st â¦ able.
Report Abuse. Because they're unstable. The nuclei of radioactive isotopes have more neutrons than protons (a stable element would have equal numbers of each) and thus emit neutrons as a way of balancing things out. This process is called decay.The time it takes for half a given amount to decay into a more stable form is called the half-life.eport Abuse. Because they're unstable. The nuclei of radioactive isotopes have more neutrons than protons (a stable element would have equal numbers of each) and thus emit neutrons as a way of balancing things out. This process is called decay.