1. Francium is the biggest element with the lowest ionization energy because it has seven shells. (the highest amount of shells). Francium is very large, and far from the nucleus, so it is easy to pull the electron away. It is also bad for grabbing electrons.
2. Helium is the smallest element with the highest ionization energy because the electrons are close to the nucleus. It would take a lot of energy to break the attraction of the positively charged nucleus and the negative electrons.
3. Noble Gases don't have EN values because since all atoms are trying to be like the noble gases (8 electrons), but since the Noble Gases already have 8 electrons, they don't want to gain or lose any more.
4. Fluorine has the highest EN because it has 7 valence electrons and it only needs one more in order for it to become a Noble Gas. It is also a small halogen, which means it is easier to attract electrons because they are closer to the nucleus.
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