Save A student has written the following answer to describe ar
explain the reactivity of group 7 elements. However,
they've made lots of mistakes. Can you correct them?
As you go down group 7, reactivity increases because it gets harder to lose an
electron from the outer shell.
This is because as you go down group 7, the outer shell gets closer to the
posative nuclues, meaning that there is a stronger force of attraction between th
nucleus and the positive electrons on the inner shell.
There is also less electron shielding as you go down group 1, because there ar
less inner shell electrons, to repel any incoming electrons to the outta shell.
All of these reasons mean that as you go down group 1, it is harder to lose an
electron from the outer shell.