Describe the trend in the reactivity of group 2 elements with chlorine as you descend down the group.
As you progress down the group:- Atomic radius increases, therefore there is more electron shielding.- There is an increase in the nuclear charge, however it is outweighed by the increase in shielding.- It is therefore easier to remove an outer electron and donate it to the chlorine molecule- Therefore down the group reactivity with chlorine (group 7 elements) decreases
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