Question

what trend in the periodic table should be expected as the atomic number of the halogens increase from fluorine to iodine

Answer 1

Well one can expected many trends
1) Reactivity and Electronegativity decreases
2)Melting and Boiling point increases
3)There is an increase in colour intensity due to the progressive shift to longer wavelengths in the spectrum of light
4) The intramolecular attraction increase and as such there is a progressive shift from gas to solid
5)Increase in oxidising power
6) Atomic and ionic radii increases
7) Electrode potential decreases