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Question

Ionisation energy and electron affinity of fluorine are respectively 17.42 and 3.45 eV. Calculate the electronegativity of fluorine atom on Pauling's scale.

A
2.726
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B
2.762
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C
3.726
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D
3.762
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Solution

The correct option is C 3.726
Electronegativity is a measure of an atom's ability to attract the shared electrons to itself. On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. Many methods were proposed to calculate electronegativity. Mulliken and Pauling's scale are well known among them.
According to Mulliken's electronegativity formula:
(XM)=Ionisation energy + Electron affinity2=17.42+3.452=10.435
Therefore, electronegativity on Pauling's scale (XP) in eV 10.4352.8=3.726

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