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 Celtics of the National Basketball Association use this shade for their uniforms, logos and other memorabilia. "Tea green" is a light shade of green. It is a representation of the color of brewed green tea, i.e., the color of the hot green tea after the green tea leaves have been brewed in boiling water. The first recorded use of "tea green" as a color name in English was in 1858. "Teal" is displayed at right. It is a dark cyan color that is a representation of the color of the neck coloring of a duck called the common teal. Olive