Now as we move to the third row, an interesting thing happens; the third shell adds a third kind of orbital: the five part harmony, with ten electrons, of the d-orbital.

现在当我们移到第三排时， 一件有趣的事情发生了；第三层增加了第三种轨道：d 轨道的五部分谐波， 具有十个电子。