STANDARDChemistry-Periodic Table and Periodicity
STANDARD Chemistry Ionisation Energy MCQ Question
Type: MCQ-conceptual-Medium
Ionisation energy in group I-A varies in the decreasing order as
A
Li > Na > K > Cs
B
Na > Li > K > Cs
C
Li > Cs > K > Na
D
K > Cs > Na > Li
Correct Answer
Option A
Detailed Explanation
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.
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