Although an electron is referred to as a spin 1/2 particle, it doesn't mean it is in a spin 1/2 state (confused yet?).  A spin 1/2 particle has two states it can be in. It can be +1/2 in which case it goes up Stern-Gerlach experiment, or it can be in the -1/2 state in which case it goes down.

If there are two unpaired electrons in a molecule, then it is called a spin 1 molecule and has three states (+1, 0 and -1).  If the 2 electrons are both spin +1/2, the molecule will go up, if 1 electron is spin +1/2 and the other spin -1/2, the molecule will go straight. Finally, if both electrons are spin -1/2, the molecule will go down in a  Stern-Gerlach experiment.

Stern-Gerlach and Hund's second rule
what am i doing wrong 

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