Photo: Niels Bohr's research notes for his new atomic theory Rutherford's find came from ... hold only certain numbers of electrons -- the first shell holds no more than 2, the second shell ...

Photo: Atomic bomb test explosion in Alamagordo ... The German government took little notice of the finding at first. But others felt the implications were immediately clear.

It follows the third of the three essays contained in “The Theory of Spectra and Atomic Constitution,” published in 1922, and forms the first of a new series expounding systematically the ...

In response to a question posed by an American historian, the U.S. military announced for the first time in 1983 that eight service members of the Army and two from the Navy died in the atomic bom ...