Chemical substance can be transmuted into another element through a nuclear reaction. This is so, because all of the atoms in a sample of an element have the same number of protons, though they may be different isotopes, with differing numbers of neutrons. As of 2012, there are 118 known elements, about 80 of which are stable – that is, they do not change by radioactive decay into other elements. Some elements can occur as more than a single chemical substance (allotropes). For instance, oxygen exists as both diatomic oxygen (O) and ozone (O). The majority of elements are classified as metals.
More Than a Memory on radio airplay alone. Since airplay usually builds at a more gradual rate than record sales do, very high debuts are less likely to occur on airplay-only charts such as Hot Country Songs. In addition to its chart-topping debut, the song was Brooks's first #1 single on "Billboard" since "To Make You Feel My Love" in 1998 (see 1998 in country music). After its debut week, "More Than a Memory" fell to #8, and after slipping to #10, it began to climb, eventually rebounding to #2 for the chart weeks of December 8 and 15 before falling out of the