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NEETChemistryClassification of Elements and Periodicity in Properties

Why does boron (Z = 5) have a smaller first ionization enthalpy than beryllium (Z = 4)?

Options

  1. ABoron has fewer electrons.
  2. BBoron has a smaller nucleus.
  3. CBoron has a greater nuclear charge.
  4. DBoron has more shielding electrons.

Correct answer

D. Boron has more shielding electrons.

Step-by-step solution

Boron has a smaller first ionization enthalpy than beryllium because the 2p-electron of boron is more shielded from the nucleus by the inner core of electrons than the 2s electrons of beryllium.

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