Group 17 or VIIA is called the most electronegative group because of their small atomic radius due to which high nuclear attraction from the relatively more no. of protons than the no. of orbits/shells.

All the Group 17 elements have outermost ns² np⁵ configuration.

The electronic configuration represents:
2s²2p⁵= fluorine = most electronegative element
3s²3p⁵ = chlorine
4s²4p⁵ = bromine
5s²5p⁵ = iodine

Thus, option (i) is correct.