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 (abbreviation Tc, atomic number 43) is the first of the two elements lighter than bismuth that have no stable isotopes (all are radioactive); the other such element is promethium.or the isotopes with an even number of nucleons, since technetium has an odd number of protons, any isotope must also have an odd number of neutrons.