How is the periodic law demonstrated with the halogens?

Question

How is the periodic law demonstrated with the halogens?

Answer 1

All halogens form ions in aqueous solution with a single negative charge.

Answer 2

Well group 7 of the periodic table known as the halogens, are all extremely reactive since they each contain 7 valence electrons and only need 1 more to complete an outer shell. The periodic law suggests that recurring patterns of the properties of elements arise when they are arranged in order of increasing atomic number. This holds true as the halogens all act very similarly with eachother in chemical reactions.