In the halogen group,fluorine has the highest electronegativity according to the Pauling scale,yet its electron gain enthalpy is less negative than that of chlorine. This is because ....

• A
  The atomic number of fluorine is less than that of chlorine.
• B
  Fluorine shows anomalous behavior as it is the first member of the group.
• C
  Chlorine can accommodate electrons more easily than fluorine by using its vacant $3d$ orbitals.
• D
  Due to its small size,high electron density,and increased inter-electronic repulsion,it is difficult to add an electron to fluorine compared to chlorine.