The element with the highest first ionisation energy among the following is:

Oxygen

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Nitrogen

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Boron

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Carbon

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Solution

The correct option is C Nitrogen
The ionisation energy is amount of energy required to take out an electron from isolated gaseous atom. Ionisation energy increases in a period. Exactly half filled orbitals have extra stability and so their ionisation energy is higher than expected. Among given choices ionisation energy of nitrogen is highest due to stable half filled configuration,

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Among the following elements element with highest ionisation enthalpy is:

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