A) \[Li>Na>K>Cs\]
B) \[Na>Li>K>Cs\]
C) \[Li>Cs>K>Na\]
D) \[K>Cs>Na>Li\]
Correct Answer: A
Solution :
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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