The elements in group 17 of the periodic table are all called halogens. All halogens have the same atomic number.
atomic mass.
number of possible isotopes.
number of valence electrons.

1. they vary with a higher number because boiling is way hotter than melting

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but