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
A Pleasant Shade of Gray former bassist Joe DiBiase, who departed the band in 1995; "A Pleasant Shade of Grey" was the first Fates Warning album without DiBiase. A Pleasant Shade of Gray A Pleasant Shade of Gray is a concept album by the progressive metal group Fates Warning, released in 1997. It contains one song divided into twelve parts and is noted for its darker mood and more progressive style. "A Pleasant Shade Of Gray" is a single song that is divided into twelve tracks. The album is notable for its darker mood and mixture of progressive rock and metal with hints of industrial,