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Question

Which of the following is the correct order of the first ionisation energy?


A
Cu>Ag<Au
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B
Cu>Ag>Au
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C
Na+>Ne>O>Na
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D
Ne>O>Na+>N
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Solution

The correct option is B Na+>Ne>O>Na
Na+1s22s22p6Ne1s22s22p6O1s22s22p4Na1s22s22p63s1

Here, Na+ and Ne are having same electronic configuration but Na+ has more number of protons than Ne so the effective nuclear charge will be higher and therefore, the energy required to remove an electron from Na+ is higher than Ne.
So, the correct order of the first ionisation energy will be
Na+>Ne>O>Na

Chemistry

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