MCQ
Which or these have no unit
- ✓Electronegativity
- BElectron affinity
- CIonisation energy
- DExcitation potential
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$A.$ $Sm ^{2+}$ $B.$ $Ce ^{2+}$ $C.$ $Ce ^{4+}$ $D.$ $Tb ^{4+}$
Choose the most appropriate answer from the options given below :