再有20多天就期末考试了,原子物理老师突然这时候给我们布置“期中考试”作业,要写4页左右的英文paper,内容必须在下列中选一个: 1. Many electron atoms and their periodic properties 2. Atoms in an external magnetic field 3. Fine structure 4. The H atom (Bohr model and the results from quantum mechanics) 感觉没什么东西能凑足4页字啊,有什么好写的呢?给点思路。