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Question

arrange in order of increasing electronegativity

H,F,Al,O

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Solution

values are given below
H-2.1
F-3.98
Al-1.61
O - 3.44

so order is Al < H < O < F

reason : F is the most electronegative element. O will be the next because it is the element which is just behind the F. Then H becasue it needs one more electron to attain a stable configruation of 2 electrons in the outermost s subshell. then Al .

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