All the elements, on the basis of long form of periodic table, can be divided into four blocks, *s, p, d* and *f*. The ionization energies, electron affinities, electronegativities, atomic and ionic radii and other physical properties usually show a regular pattern of change within a group or along period with some irregularities.
Which of the following element has the maximum electron affinity?
a. Nitrogen
b. Oxygen
c. Fluorine
d. Chlorine