Everyone at that time imagined the atom as a "plum pudding ... emitted by the radioactive element radium) at a sheet of gold foil only 1/3000 of an inch thick, and tracing the particles' paths.

IN a letter to NATURE of November 25 last Dr. Norman Campbell discusses the problem of the possible consistency of the assumptions about the motion and arrangement of electrons in the atom ...

Particle diagrams can be used to show the ... Water has a specific ratio of two hydrogen atoms to one oxygen atom. Compounds made from non-metal elements that are bonded together usually form ...