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Question

Find the element with the greatest first ionization energy.

A
Ce
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B
C
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C
Cl
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D
Ca
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E
Cs
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Solution

The correct option is D C
Carbon is the element with the greatest first ionization energy. On moving down in a group, the ionization energy decreases. On moving from left to right in a period, the ionization enthalpy increases. The first ionization enthalpy of C is 1086 kJ/mol.

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