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Fluorine
Fluorine is the lightest element in the Halogens family, it can react with almost every element, and can even react with the noble gases(when in high temperatures and pressure).
Uses: It is used in toothpaste and drinking water to prevent dental cavities
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Who discovered it:Henri Moissan
When was it discovered:1886
Symbol:F
Group:7
Row:2
Number of Protons(+):9
Number of Neutrons:10
Number of Electrons(-):9
Atomic Mass:18.998403 u ± 5 × 10 u
Electron Configuration:[He]2s 2p
2
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5
-7
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