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).
There are over 1,000 known radioactive isotopes of elements in the periodic table. There are many applications of radioactive isotopes in various fields. In this lesson, we will learn all about radioactive isotopes and their uses. Before we go into discussing radioactive isotopes, let's recall what an isotope is. Let's look at the picture of an atom below. It has a nucleus made up of protons and neutrons, with electrons around the nucleus. All the atoms of an element have the same number of protons, but the number of their neutrons can differ.