Question

observe. the. modern. periodic. table. and. explain. the. gradation. in. reactivity. of. halogen. family​

Answer 1

Answer:

All halogens have one electron less in their outermost shell. one shell increses top to bottom.so attraction between nucleus and outermost shell decreases. so in halogens family reactivity decreases from top to bottom. Flourine is most reactive and astatine is least reactive.

Answer 2

Answer:

they have stable electronic configuration

so they do not react with anything