Answer:
Electronegativity varies in a predictable way across the periodic table. Electronegativity increases from bottom to top in groups, and increases from left to right across periods. Thus, fluorine is the most electronegative element, while francium is one of the least electronegative.Explanation:
Astatine. Because it has the smaller shell of electrons. I believe
They become more stable because they achieve a full outer shell of valence electrons with the magic number of 8.
