jan 4, 1913 - 1913 AD: Niels Bohr, a Danish physicist improved on Rutherford’s model, claiming that electrons moved in specific layers or shells and each shell could only have a certain number of electrons. His model was announced in 1913 and is known as the Bohr model.
Added to timeline:
Date:
jan 4, 1913
Now
~ 112 years ago