What is gadolinium break?

For all lanthanides pre Gd the coordination number with water in solution is 9, however for Gd and post Gd lanthanides the coordination drops to 8 and eventually down to 6. read more

Gadolinium has an anomalous configuration, $\ce{[Xe] 4f^7 5d^1 6s^2}$ because it acquires greater stability by promoting an electron to the orbital d, and keeping all the electrons in f unpaired. However, from $\ce{Gd}$ to $\ce{Lu}$, a new stage begins, the electrons begin to pair in the orbitals f. read more

Gadolinium-153 is produced in a nuclear reactor from elemental europium or enriched gadolinium targets. It has a half-life of 240 ± 10 days and emits gamma radiation with strong peaks at 41 keV and 102 keV. read more