I took a week off from blogging last week for a number of reasons. One was that I was having trouble getting my mind around topics. Another was being in sort of a strange set of moods that have made concentration rather difficult. Yet again, and probably the root cause of the other two is either spending large amounts of time with someone (no time to write) or no time at all (no motivation to write). In any event, I think that I have some balance back.
I got tired of writing about carbon so we shall move on to nitrogen. With an atomic number (Z) of 7, it is the element after carbon. Nitrogen is another of the few elements that ordinary people encounter on a daily basis, because it comprises around 78% of the atmosphere of the earth.
There are two stable isotopes of nitrogen, the very common 14N (99.64%), the rest being 15N. Both of these isotopes are formed in larger stars by stellar nucleosynthesis. Nitrogen is peculiar in that it is one of only five nucleides that are stable with both an odd number of protons and neutrons. It is really unusual in that 14N is by far the most common isotope of nitrogen.