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Bohr One of the foremost scientists of the 20th century, Niels Henrik David Bohr
was the first to apply the quantum theory, which restricts the energy of a system to
certain discrete values, to the problem of atomic and molecular structure.
was pure hydrogen or whether there was also a substantial amount of helium. It
is usual to try to devise the simplest theory that can account for the small number
of reliable observations of agreed cosmological significance. This need not imply
Not until late in the 1 7th century, however, did theory and philosophical
speculation become conjoined in the first of many far-reaching attempts to
explain chemical reactions. The German chemist and physician Georg Ernst
Stahl, basing his ...
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For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review