The first-ionization energies and electron affinities for four consecutive elements in the same period are shown.
Element First I.E. (kJ/mol) Electron Affinity (kJ/mol)
P 496 –72
Q 738 –320
R 801 –40
S 1000 –195
Based on the data, which element is most likely to be a halogen?
a) S
b) P
c) Q
d) R