CAS CH 102 Lecture Notes - Lecture 27: Electron Shell, Electron Configuration, Photon
Document Summary
Rutherford"s model has a small, dense, positively charged nucleus around which electrons moved around in an otherwise empty space. Bohr"s model is an improvement of rutherford"s where the electrons are not roaming in space, but are in an orbital path around the nucleus. This model is used to show how many electrons are in each electron shell of an atom. This model shows regions of the most probable locations of an electron, called orbitals. This is used to show how many valence electrons an atom has (up to 8). The number of dots should be the last number in the electron configuration listed below the element on the periodic table. On the periodic table, the number at the right end of the electron configuration (written on the bottom right of the atom"s box) is the number of valence electrons the atom has. In the excited state, an electron from the second to last shell moves up to the last shell.
