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__________ are the most and the least electronegative elements in the periodic table.

1. Fluorine and Caesium
2. Hydrogen and Helium
3. Carbon and Oxygen
4. Chlorine and Fluorine

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+1 vote

Caesium is the least electronegative element in the periodic table and Fluorine is the most electronegative element.

So, option A)Fluorine and Caesium will be the right answer.

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Caesium is the least electronegative element in the periodic table and Fluorine is the most electronegative. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.

So, the correct answer is $(A).$
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