Vitamin B12, also known as cyanocobalamin, is a water-soluble vitamin that is part of the B vitamin family. B vitamins help support adrenal function, help calm and maintain a healthy nervous system, and are necessary for key metabolic processes.
For each of the 80 stable elements, the number of the stable isotopes is given. Only 90 isotopes are expected to be perfectly stable, and an additional 163 are energetically unstable, but have never been observed to decay. Thus, 253 isotopes (nuclides) are stable by definition (including tantalum-180m, for which no decay has yet been observed).
Quick Answer. The are 92 naturally occurring atoms, or elements. Two of these elements, Technetium and Promethium, are highly unstable and are sometimes not counted in the total number of natural atoms found on the earth. There are more than 100 elements listed on the periodic table, but the first 92 are those that occur in nature. The remaining elements were made in laboratories. The two elements Technetium and Promethium have traits that cause them to occasionally be left out of the count of naturally occurring atoms. 1  Technetium is unstable, has a very short half-life and, while it is found in extremely small quantities on earth, it is usually artificially produced in kilogram quantities.