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Q.

What is the trend of ionisation enthalpy down the group?

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a

decreases

b

remains the same

c

increases first and then decrease

d

increases

answer is B.

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Detailed Solution

  • Ionization energy decreases down the group because the atomic size of the atom increases.
  • If the atomic size increases, the force of attraction between the nucleus and electrons in the outermost orbit decreases as the distance between them increases.
  • Due to this, the outermost electron is held less tightly bonded to the nucleus so less energy is required to remove it. Thus, ionization energy decrease down the group.
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