1 Which one of these atoms will have electrons in its outermost shell (highest energy level) that experience the greatest attractive force between themselves and the nucleus?
helium lithium fluorine potassium argon
Explain your answer. [4 marks]
2 Explain why potassium is more reactive than lithium. (I) [4 marks]
3 Explain why fluorine is more reactive than bromine. (4) [4 marks]
4 Predict the difference in reactivity, giving reasons, seen in:
a Group 2, between magnesium and calcium
[5 marks]
b Group 6, between oxygen and sulfur.
[5 marks]