Why Big Fr and Hungry F

1. Francium is the biggest element with the lowest IE and EN because it is a very heavy alkali metal that has the most shells yet it has the fewest protons of the entire row in the periodic table. Also, Fr is in the bottom of all alkali metals; IE and EN increases as you move right towards the periodic table.
2. Helium is the smallest element with the highest IE because it has the strongest attraction to its electrons and has an electron affinity of less than zero. It would take more energy to detach an electron from noble gases. Because it is the smallest element, it holds it electrons the tightest
3.  Noble gases don't have EN values because they have a full valence shell, are stable, and are electrically neutral. Thus they are unreactive, and so don't have electronegativity values.
4. Fluorine has the highest EN because it is the furthest element moving left to right, and also the furthest element moving from bottom to top.It is more likely to gain an electron, making it the most reactive element.