🌐EnglishEnglishDeutschEspañolItalianoNederlandsไทย中文日本語EntityQ360686· pop 11· linked from 20 articlesBohr-Sommerfeld atom modelextension of the Bohr model to allow elliptical orbits of electrons around an atomic nucleusConnectionsSchrödinger's catEntityBohr modelEntityCategoriesArnold SommerfeldAtomic physicsFoundational quantum physicsHistory of physicsHydrogen physicsNiels BohrOld quantum theory