WHY is fluorine so highly reactive?

I'm doing a chemistry assignment and always come across websites that tell me how mcuh fluorine is so reactive...like, giving examples of how they react with some noble gases like krypton, xenon, and radon...and is extreemly reactive with moisture in the air, which forms hydrofluoric acid and the list goes on and on and on...but i want 2 know WHY it's so reactive, what makes it so highly reactive??? I can't find any information on this at all! So if anyone can help out there, that'd be really helpful! Thanx!

Answer:
It has to do with the electron shell and its distance from the nucleus.

Flourine has a total of 9 electrons, 2 in the first and 7 in the second. Those 7 electrons are tightly bound to the nucleus because they are so close. The atom has a VERY strong affinity to get the missing 8th electron needed to have a full shell. So it will jump at the chance to make a covalent bond with any atom that will share an electron. The bond it makes is likewise very strong.

Toss flourines onto a carbon chain and you have teflon. Toss them onto single atoms and you have the contents of a halogen fire extinguisher. These molecules are relatively inert because the bond with teflon is most tight. It's most tight because of the nearness of the shell to the nucleus.

As you go down the column on the periodic chart, each row has another electron shell. The shell that is missing an electron (or has an extra one) is further from the nucleus. So the nucleus' affinity for those outer electrons is less. Therefore they are not as reactive as Flourine.
A yellow gas at room temperature, it is the most reactive and electronegative of all the elements. Electronegativity is the tendency of an atom to attract a bonding pair of electrons. It reacts explosively with hydrogen and is reactive with all other elements as well except for nitrogen and oxygen. Fluorine has a tendency to form ions with heavy metals such as iron, aluminum, and manganese. Since it does have an unstable property, fluorine is hardly ever found in its simplest elemental form, but rather as the fluoride ion (F-).
Fluorine is the most electronegative element in the periodic table: which means that it loves electrons and pulls them to itself.
This also means that it's really hard to take fluorine's electrons, which makes reactions with this element quite explosive and exothermically (releasing energy).

Fluorine only needs one more electron for it to be isoelectronic with the noble gas neon. Having eight electrons make a compound stable.

Hope this helps.
well, since you are doing chemistry then you should know all about valence electrons. yes, that's right; they are electrons that are in the last orbit of an atom. keep that in mind.

now, fluorine is a very electronegative element. it is in the 17th group of the periodic table of elements, which means that it has 7 valence electrons; just one short of a stable octet.
furthermore, it is a small atom, which means that it's nucleus (protons and neutrons in the centre of the atom) exerts a very strong force on all the electrons in the orbit as well as free electrons and electrons of other elements.

this is why fluorine is highly reactive.
The main thing to consider is electronegative (an atoms electron attracting power). The group of halogens all have high electronegativities because they all have 7 electrons in their outer shells, which means that they really really really want to fill their outer shell. Period wise, as you move down, and another electron shell is added, the valence (outer shell) electrons become further away from the nucleus. This means that the positive pull of the protons is shielded by the extra layers of electrons therefore decreasing electronegativity as you move down the table.

So in summary, pull is high for halogens as they really want to fill outer shell, and pull extra high for F as its valence electrons are closer to the protons.

Hope that helps, good luck!
fluorine is the most reactive element because it has the highest electronegativity and ionization energy of all the elements. electronegativity is measured as the ability to attract other elements, and fluorines value is 4.0
From my own knowledge that Fluroine is from Group 17 that isnot so reactive like Group 1 which contains Hydrogen , Lithium, Sodium............etc. But Group 17 has 7 valence electrons , this group isnt so reactive like Group 18 both same

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