Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Ionisation energy in group I-A varies in the decreasing order as
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Due to the large size of group IA elements, the outermost electron is far from the nucleus and can easily be removed. their ionisation energies or ionisation potentials are relatively low.
Li Na K Rb Cs
Ionisation potential (eV) 5.4 5.1 4.3 4.2 3.9
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