Term Symbols and Spin Angular Momentum

We have avoided the topic of spin for quite a while in this text but now we have to consider what it means. The easiest explanation is the most mysterious. We can say that electrons are particles that have an intrinsic amount of angular momentum. We know energy comes in quantum chunks and that kinetic energy is made from momentum so we can extend that idea to say that 

The most famous experiment related to spin was the Stem-Gerlach experiment [13] in 1922. In that experiment, silver was vaporized in an oven and allowed to exit as a beam, which traveled between a long pair of magnet poles each machined to a knife edge. From chemistry, we know Ag has one outer electron and the Schrodinger model would describe the electron orbital occupancy as (li )(2i 2p ) 3s 3p 3d ) As 4d °)(5 ). As the Ag atoms traveled through the long path, the 

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