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Binyu You
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Postby Binyu You » Sat Nov 07, 2020 1:47 am

Why does fluorine has the highest electronegativity in all elements of periodic table?

Shanna Yu 1C
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Re: Fluorine

Postby Shanna Yu 1C » Sat Nov 07, 2020 2:00 am


As you may know, fluorine only needs one more electron to have a complete octet. In simpler terms, this means it really, really wants to get the one electron that it needs to complete said octet, which means it's pretty electronegative.

Now, as to why it happens to be the most electronegative out of its fellow halogens, I believe it has something to do with its small size. As the smallest of the halogens, there aren't as many layers of electrons to shield the pull its nucleus has, which makes its pull stronger and makes it easier for its nucleus to attract electrons.

Someone can correct me if I'm wrong, though!

Hasmik Dis 2F
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Re: Fluorine

Postby Hasmik Dis 2F » Sat Nov 07, 2020 2:24 am

^ Flourine's small size does have associations with its electronegativity. Since the atom is extremely close to fulfilling its octet, the nucleus is going to tightly hold onto the electrons. This is why it also has a relatively smaller radius than the other atoms in the same group (the nuclear charge is stronger, pulling the electrons closer, and thus decreasing the radius).

Earl Garrovillo 2L
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Re: Fluorine

Postby Earl Garrovillo 2L » Sat Nov 07, 2020 6:52 pm

Firstly, since Fluorine already has 7 valence electrons, it really "wants" another valence electron to fulfill the octet rule. This is the case for all the other halogens as well. Now why it's more electronegative compared to the other halogens, as the others have said, is due to Fluorine's size. Fluorine is a smaller atom so it's easier for the positively charged nucleus to attract the valence electron of another atom due to its closer proximity.

Bai Rong Lin 2K
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Re: Fluorine

Postby Bai Rong Lin 2K » Sun Nov 08, 2020 11:35 pm

Binyu You wrote:Why does fluorine has the highest electronegativity in all elements of periodic table?

It has to do with its valence electron and that it is highly reactive

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Re: Fluorine

Postby rhettfarmer-3H » Sun Nov 08, 2020 11:43 pm

Since fluorine has 7 electrons it has a uncatering ability to get to that filled valence electrons therefore, it battles for that extra one electron and is willing to go the mile to get it, it makes sense that it wants that last electron. Also it for that sake it has the highest in its column because it is small atom so it has a stronger centralized attraction positive charge to get that extra electron.

Emma Healy 2J
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Re: Fluorine

Postby Emma Healy 2J » Sun Nov 08, 2020 11:51 pm

Knowing that Fluorine is the most electronegative element and that it's not in the very top right corner of the periodic table, would Helium be considered an exception to the trend since it is in the very top right corner?

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Re: Fluorine

Postby Jack_Pearce_2H » Mon Nov 09, 2020 5:06 am

Fluorine has the least electron shielding due to a low number of inner shells (thus a higher effective nuclear charge) and a HUGE affinity for electrons due to its 7 valence electrons. This makes a single fluorine atom intrinsically unstable and in need of an 8th electron to complete the octet, giving it a large electronegativity.

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