Which of the following will have the highest first ionization energy?
A
Halogens
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B
Alkali metals
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C
Alkaline earth metals
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D
Noble gases
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E
Lanthanides
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Solution
The correct option is E Noble gases Noble gases will have the highest first ionization energies. The octet of noble gases is complete. When they lose one electron, they break this stable electronic configuration. This requires higher energy.