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Question

The electron affinity and ionization potential of iodine are 3.43 eV and 10.5 eV respectively. The electronegativity of iodine in Pauling scale is:
(correct answer +2, wrong answer -0.5)

A
3.48
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B
2.48
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C
1.5
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D
2.2
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Solution

The correct option is B 2.48
We know that,
Electronegativity can be calculated using Mulliken's formula,

Electronegativity =Ionization energy + electron affinity2
=3.43+10.52=6.96

Mulliken's scale is 2.8 times the Pauling scale.
Hence, Pauling electronegativity 6.962.8=2.48

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