Content deleted Content added
Bibcode Bot (talk | contribs) m Adding 0 arxiv eprint(s), 1 bibcode(s) and 1 doi(s) in 3 possible templates. Did it miss something? Report bugs, errors, and suggestions at User talk:Bibcode Bot |
irrelevant and misplaced artwork by unknown artist removed. |
||
Line 35:
==Bohr model of the atom==
{{Main|Bohr model}}
By the early 20th century, it was known that [[atom]]s consisted of a diffuse cloud of negatively-charged [[electron]]s surrounding a small, dense, positively-charged [[Atomic nucleus|nucleus]]. This suggested a model in which the electrons circled around the nucleus like planets orbiting the sun.<ref group="note">The classical model of the atom is called the planetary model or the [[Rutherford model]], after [[Ernest Rutherford]] who proposed it in 1911, based on the [[Geiger-Marsden experiment|Geiger-Marsden gold foil experiment]] which first demonstrated the existence of the nucleus.</ref> However, it was also known that the atom in this model would be unstable: the orbiting electrons should give off electromagnetic radiation, causing them to lose energy and spiral towards the nucleus, colliding with it in a fraction of a second.
| |||