Aluminium
It is the 12th most abundant of all elements. It is the 3rd most abundant among the elements that have odd atomic numbers. The only stable isotope of aluminum is aluminum-27. It is the 18th most abundant nucleus in the Universe. It is created after fusion of carbon in massive stars that will later become Type II supernovae: this fusion creates magnesium-26, which, when capturing free protons and neutrons becomes aluminum. Essentially all aluminum now in existence is aluminum-27; aluminum-26 was there in the early Solar System but is now extinct. The trace quantities of aluminum-26 that do exist are the most common gamma ray emitter in the interstellar gas.