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31 dez 1912 ano - Niels Bohr

Descrição:

Planetary Model
Electrons orbited the nucleus in fixed orbits of differing energy levels.
Positive - Stable electron orbits with emission spectra.
Negative - Doesn't work for heavier elements.

Adicionado na linha do tempo:

Data:

31 dez 1912 ano
Agora
~ 112 years ago