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CGP EDU Academic Team
Published on: August 11, 2026
The set representing the correct order of first ionisation potential is :
Text Solution
Verified by ExpertsThe correct answer is:
B
Down the group size increases and, therefore, attraction between valence shell electron and
nucleus decreases and thus ionisation energies decrease. Along the period the atomic size decreases and nuclear charge increases. So generally the ionization energy increases. However, half-filled and completely filled valence shell electron also affect the ionization energies along the period.
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