Think of d, think of d fondly, when you're in 4s,
Remember d, starting with scandium, and in all the rest,
And when you find, that once again you fill, with Aufbau chromium's 3d,
If you take an e from 4s, spare a thought for d.

We never said our orbitals were filled, or possessing opposite e's,
But if our atoms are ground state, stop and think of d.