In the following four elements, the ionisation potential of which one is the highest?
A
Oxygen
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B
Argon
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C
Barium
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D
Cesium
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Solution
The correct option is C Argon Noble gases have very stable configuration. It is not easy to remove a electron from such a stable configuration. Thus, noble gases have highest ionization potential in a particular group. Therefore, among the given options argon has highest ionization potential.