#2.1
understand how the similarities in the reactions of these elements with water provide evidence for their recognition as a family of elements
#2.2
understand how the differences between the reactions of these elements with air and water provide evidence for the trend in reactivity in Group 1
#2.3
use knowledge of trends in Group 1 to predict the properties of other alkali metals
#2.4C
explain the trend in reactivity in Group 1 in terms of electronic configurations