its atomic no. is 9 and it gains 1 electron to become stable.
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To create a ion you have to add or take away electrons.
These electrons must be taken from or added to an other atom.
Look at El Phaba's answer as an example, it's a good one:
El Phaba writes: "when it joins with a metal - eg sodium fluoride NaF, has a sodium ion Na+ and a fluoride ion, F-"
The Na (sodium gives away one of his electrons, making it positive (Na+). The F (fluorine) takes this electron and adds it to his own, making it a negative F- (fluoride).
Finally as they are both negative and positive the attract each other and form NaF (sodium-fluoride) together.
These electrons must be taken from or added to an other atom.
Look at El Phaba's answer as an example, it's a good one:
El Phaba writes: "when it joins with a metal - eg sodium fluoride NaF, has a sodium ion Na+ and a fluoride ion, F-"
The Na (sodium gives away one of his electrons, making it positive (Na+). The F (fluorine) takes this electron and adds it to his own, making it a negative F- (fluoride).
Finally as they are both negative and positive the attract each other and form NaF (sodium-fluoride) together.
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By gaining an electron. Initially, the electronic configuration is 2.7 Therefore, the fluorine can easily take up an electron to make its outer shell full that is, 8 electrons. Hence when picking up an electron, the fluorine atom becomes an anion, F- to show that it has more electrons than protons by 1.
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A fluorine atom has 9 electrons, and 9 protons giving it an overall neutral charge as the 9 positive and 9 negative cancel each other out.
A fluoride ion is created when fluoride has an extra electron (it is reduced), giving it an negative charge of 1 (F-)
A fluoride ion is created when fluoride has an extra electron (it is reduced), giving it an negative charge of 1 (F-)
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when it joins with a metal - eg sodium fluoride NaF, has a sodium ion Na+ and a fluoride ion, F-
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If it gains an electron.