one
One, and only one.
Fluorine has 7 valence electrons and should gain 1 more electron.
A fluorine atom will typically gain one electron to achieve a stable electron configuration by filling its outer shell with a total of 8 electrons. This results in a fluorine ion with a negative charge, known as fluoride.
In a reaction u need two valence electrons to gain or share two valence electrons.
Fluorine has 9 electrons.
There is zero NET loss or gain of electrons
One
A fluorine atom has 9 electrons.
Fluorine is a non metal element. There are 9 electrons in a single atom.
Fluorine will gain one electron to form F- (or fluoride) ion. Fluoride ion has a charge of -1.
There are 10 core electrons in fluorine. This includes the electrons in the inner electron shells (1s and 2s) of the fluorine atom.
There are 9 electrons in the atom without a charge, . The Fluorine ion (F -), has 10 electrons.