In some cases, such as the atomic theory, it has taken centuries.

The use of the word nucleus in atomic theory, however, did not happen immediately.

Here you can learn about nuclear power plants, atomic theory and radiation.

And maybe the atomic theory as well, while we're about it?

Basically, it dates to the days before atomic theory was developed (which actually wasn't very long ago).

His research in molecular structure was one of the early steps leading to modern atomic theory.

He is the author of "Force and Nature", an early work on atomic theory.

There were all sorts of other problems with Dalton's atomic theory.

The atomic theory of matter holds in every area of science.

He did not believe in Democritus' theories about the atomic theory.