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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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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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