Question #7701f

1 Answer
Sep 13, 2017



In a neutral atom, where charge is zero, the number of protons is equal to the number of electrons. Since the charge of one electron is (-1) and of one proton is (+1) so their number should be equal so that the charge will balance out

#rarr# number of electron in a neutral fluorine atom is equal to number of protons in a neutral atom
#"number of protons"="number of electron"=9#

Since in your example the fluorine atom is not neutral, and has a charge of -1, then there is one extra electron that gave the atom the charge,
#rarr "number of electrons" = "number of protons" + 1= 9+1= 10#