1. Why Francium is the biggest element with the lowest IE and EN?
It has 7 shells so it's the biggest electron. It has the lowest IE because it does not take that much energy to pull away the electrons. It's not great at attracting electrons and loses it's electrons easily. Francium has lowest EN because it does not need anymore electrons since it's too big and can't hold on to valence electrons.
2. Why Helium is the smallest element with the highest IE.
Helium is the smallest element because as you go horizontally, the size decreases. It also only has one shell. Helium holds its electrons tight so it has high IE.
3. Why Noble Gases don't have EN values?
Noble Gases don't have EN values because the electron shell is already full so it won't gain or lose electrons.
4. Why Fluorine has the highest EN?
Fluorine has the highest EN because it is easy for it to gain electrons. Fluorine is a halogen, it has 7 valence electrons and it wants to gain 1 more electron to fill in it's shell. Fluorine is also the smallest atom and has the greatest attraction to nearby electrons.
