He suggested that an atom ... model. Scientists changed the model so that it could explain the new evidence. 1909-1911 Rutherford (and Geiger and Marsden) Some positively charged particles fired ...

Lithium, whose silvery-white colour tarnishes on oxidation when exposed to air, is the most electropositive metal (−3.04 V versus a standard hydrogen electode), the lightest (M = 6.94 g mol −1 ...

The thinnest bands of gold - just a single atom layer thick - have been created using a century-old technique. The ...

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.

An atom is so small that a single drop of water contains more than a billion atoms. Although tiny, atoms are mostly empty space. The simplified model of the atom is that of a cloud of negative ...