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This is a fact you could look up on the internet. Basically, it has to do with the valences of both Francium and Fluorine, that is how many bonds they could create, based on the number of electrons they both possess in their valence shell. Simply put, more empty spaces in the valence shall usually mean the element can create more bonds with other elements or molecules.

2006-10-11 12:18:46 · answer #1 · answered by x overmyhead 2 · 0 0

It has to deal with electronegativity
Francium's valence electron is so far away from the nucleus that it is easily stripped, this becoming and ion which is very reactive.
Fluorine only needs 1 electron to complete it's vanence shell...which is very close to the nucleus. This high electronegativity cause fluorine to easily strip electons from most other substances again becoming an ion which is very reactive

2006-10-11 13:38:33 · answer #2 · answered by The Cheminator 5 · 0 0

Na Sodium It's so reactive that it burns on contact with water taking the Oxygen and liberatong Hydrogen which may explode!

2016-03-17 04:33:28 · answer #3 · answered by Beverly 4 · 0 0

The electron orbits are horrendously low.

So it takes electrons from anywhere.


Interesting fact, there is only about 20 grams of francium in the world.

2006-10-11 12:19:07 · answer #4 · answered by devinthedragon 5 · 0 0

flurine is trhe most electronegative among nonmetals(left and up electronegativity increases)

and francium is the biggest among the metals and the bigger the atom, the looser will be its outer electrons . so its the most reactive

2006-10-11 14:48:52 · answer #5 · answered by Deepu 1 · 0 0

it all depends on the number of valance electrons. for a metal if it has only one valance electron its very easy for it to lose that last electron and form a positive charge therefore its very reactive.on the other hand fluorine which is a non-metal has 7 electron in its valance shell just needs to gain one electron to become stable and form a negative charge. both metals and non metals need a total of 8 electrons in its valance shell to be stable. metals lose electrons coz its easy for it to lose 1,2 or 3 electrons while non-metals can gain either 1, 2 or 3 electrons to have a fully filled orbital.
for more details please visit this site:
http://www.webelements.com/webelements/elements/text/Fr/econ.html

2006-10-11 12:32:47 · answer #6 · answered by rohit 2 · 0 0

because thats what the periodic table says.

2006-10-11 12:13:31 · answer #7 · answered by meg *__* 5 · 0 3

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