How does the reactivity change down Group 1 elements, and why?
The reactivity increases. Group 1 are the alkali metals so they react by losing their valence electrons. Caesium is more reactive because it gives up its electrons more readily. It has more inner shells so its valence electrons are further from the positive nucleus and feel less attraction.
EH
Related Chemistry A Level answers
All answers ▸How do you describe the process of recrystallisation to purify a product?
Can you explain the trend in ionisation energy across the periodic table?
In an experiment a burrette was identified as the largest source of uncertainty, how could this uncertainty be reduced?
What is a buffer and what do you need to make one?