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 Whiter Shade of Pale Shade of Pale" at Olympic Sound Studios in London, England. The recording was produced by Denny Cordell. Because they did not have a regular drummer, the drums were played by Bill Eyden, a session musician. The track was completed in two takes, with no subsequent overdubbing. A few days after the session, the band re-recorded the song with their newly recruited drummer, Bobby Harrison, at Advision Studios. This version was discarded, and one of the original mono recordings was chosen for release as the band's debut single. The B-side was "Lime Street Blues", another Brooker–Reid song, which the band recorded