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NEETChemistryd and f Block Elements

Which lanthanoids exhibit an abnormally low value of the third ionization enthalpy?

Options

  1. ALanthanum, cerium, and neodymium
  2. BEuropium, terbium, and dysprosium
  3. CGadolinium, erbium, and thulium
  4. DLanthanum, gadolinium, and lutetium

Correct answer

D. Lanthanum, gadolinium, and lutetium

Step-by-step solution

The abnormally low value of the third ionization enthalpy is exhibited by lanthanum, gadolinium, and lutetium.

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