Internal Examination of a Newly Hatched Alligator. A professional can determine the gender of a very small baby alligator, 6 to 10 inches long. One method is to place the creature on its back and hold open his vent with round-tipped tweezers or forceps, with a helper's assistance.
Technetium is the only element below uranium that does not exist on Earth. It is a synthetic (man-made) element produced in a particle accelerator. For many years, chemists knew that an element with atomic number 43 must exist, based on an empty spot in the periodic table.
Technetium-99 is the most abundant of all isotopes since it is a major fission product in nuclear reactors (5). Moreover, the use of Technetium-99m in nuclear medicine is increasing Technetium-99 abundance. Technetium-99m is a metastable isotope that is a gamma decay product of Molybdenum-99, another abundant fissile product. Indeed the amount of Tc in the environment is going up in all its forms but especially Tc-99.