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NEETChemistryp Block Elements (Group 15, 16, 17 & 18)

What is the main factor leading to the decrease in ionization enthalpy down Group 15?

Options

  1. AIncrease in atomic size
  2. BDecrease in number of valence electrons
  3. CReduction in metallic character
  4. DPresence of completely filled d orbitals

Correct answer

A. Increase in atomic size

Step-by-step solution

The paragraph attributes the decrease in ionization enthalpy down Group 15 to the gradual increase in atomic size.

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