Q5
This question is about reactivity. A student wrote an explanation of why the
reactivity of the elements changes moving down groups 1 and 7. (3)
David: The reactivity changes moving down a group because the distance
between the outer shell electrons and the nucleus changes. Group 1 become
more reactive because the distance is greater and the electrons are repelled
more so are easily lost. Group 7 become less reactive because the distance is
greater and the electrons are less attracted to the nucleus.
nk David is correct/incorrect because...