14 h 19 min, 19 juill. 1885 ans - Niels Bohr
Description:
He proposed that electrons are in an orbit and when they get excited they go to a higher orbit but when they fall they give off light.Ajouté au bande de temps:
Date:
14 h 19 min, 19 juill. 1885 ans
Maintenaint
~ Il y a 138 ans
