1. Which element has the largest atom?
2. Which element is the most electronegative?
1. Rb has the largest atomic radius, since it is in the bottom of the first group. As it is known, the radius increases down the group and decreases for elements from the first group to the eighth group in the period. 2. F – the most electronegative element. The electronegativity increases in order of increasing atomic number for the period, and decreases down the group.