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NEETChemistryd and f Block Elements

Ionization enthalpies of Ce, Pr, and Nd are higher than Th, Pa, and U. Why?

Options

  1. ACe, Pr, and Nd have a smaller atomic size than Th, Pa, and U.
  2. BCe, Pr, and Nd have more stable electronic configurations than Th, Pa, and U.
  3. CCe, Pr, and Nd have a higher nuclear charge than Th, Pa, and U.
  4. DCe, Pr, and Nd have a lower number of protons than Th, Pa, and U.

Correct answer

B. Ce, Pr, and Nd have more stable electronic configurations than Th, Pa, and U.

Step-by-step solution

Correct Option is : (B) Ce, Pr, and Nd have more stable electronic configurations than Th, Pa, and U.

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