Chemical element whole number. For example, the relative atomic mass of chlorine is 35.453 u, which differs greatly from a whole number as it is an average of about 76% chlorine-35 and 24% chlorine-37. Whenever a relative atomic mass value differs by more than 1% from a whole number, it is due to this averaging effect, as significant amounts of more than one isotope are naturally present in a sample of that element. Chemists and nuclear scientists have different definitions of a "pure element". In chemistry, a pure element means a substance whose atoms all (or in practice almost all) have the
Shades of green a color name in English was in 1805. "Avocado" is a color that is a representation of the color of the outer surface of an avocado. The color avocado is a dark yellow-green color. Avocado was a common color for metal surfaces (including automobiles and household appliances), as well as the color harvest gold, during the whole decade of the 1970s. They were both also popular colors for shag carpets. Both colors went out of style by the early 1980s. "Dark green" is a dark shade of green. A different shade of green has been designated as "dark green (X11)"