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Fluorine is the most electronegative because if you went further to the right or higher up, you'd reach noble gases. Electronegativity is a measure of a tendency for an atom to attract an electron. Noble gases already have a full octet or in the case of helium 2 electrons and do not need any more electrons so they will not attract anymore.
You can think of electronegativity as how "hungry" an atom is for electrons, usually because it wants to complete its outer valence shell. Since the furthest right elements of the periodic table are the noble gases, which are stable and already have completed valence shells, they aren't very electronegative at all, compared to flourine, which is extremely electronegative because it has seven out of eight valence electrons in its outer shell and only needs one more to complete it.
I think it's the highest electronegativity because it is at the top right of the periodic table. Halogen's are known for being very reactive because of their valence shell being one electron away from a full octet. Although Neon is further right on the table, it is a noble gas, which are nonreactive, so electronegativity doesn't really apply to them.
Fluorine is the most electronegative element because it has 5 electrons in its 2p shell. Since fluorine is close to the ideal electron configuration of 6 electrons in its p shell and given that it has a relatively small atomic radius paired with its nuclear charge, fluorine is the most electronegative. Also, since its the top of the halogen group it is extremely reactive. Hopefully this helps.
Fluorine is the most electronegative element because it almost has a full valence shell, and since its atomic radius is relatively smaller than the other elements in its column/group, the positively-charged nucleus has a higher chance of attracting the last negatively charged electron to fill this shell.
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