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: The most [[Stable Isotope|stable isotope]] of [[Fluorine]] has 10 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Relative Atomic Mass|atomic mass]] of 19.
: An [[atom]] of [[Fluorine]] is missing one [[electron]] from having a full [[Outer Shell|outer shell]].
: '''Fluoride''' [[ion]]s gain 1 [[electron]] to get a full [[Outer Shell|outer shell]] and become [[Negative ChargedCharge|negatively charged]].
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