The Lanthanoid ion which would form coloured compounds is ______
Atomic numbers: Yb = 70, Lu = 71, Pr = 59, La = 57
1
Yb2+
2
La3+
3
Lu3+
4
Pr3+
The Lanthanoid ion which would form coloured compounds is ______
Atomic numbers: Yb = 70, Lu = 71, Pr = 59, La = 57