Discussion
The first and second ionization enthalpies of lanthanoids are comparable with the element
Answer: B
They are comparable with those of Calcium.
The first and second ionization enthalpies of the lanthanoids are around 600 and 1100 to 1200 kJ mol-1, similar to calcium's 590 and 1145. This is why the lanthanoids are reactive metals behaving much like calcium, losing electrons readily, while the third ionization enthalpy is what decides how stable the +3 state is.
Chromium, germanium and cadmium are not used as the comparison, and caesium's second ionization enthalpy is enormous because its second electron comes from a noble-gas core.
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