Flourine

Atomic symbol: F
Atomic number: 9
Atomic mass: 19.00

Appearance: Pale yellow gas at STP

Group: 17
Period: 2
Series: Halogens (Reactive nonmetals)
Block: p
Electron configuration: 1s² 2s² 2p⁵

Fluorine at room temperature, F~2~, is highly toxic and extremely reactive.

Most electronegative element.

Fun Fact! Compounds of fluorine, such as sodium fluoride, are used in toothpastes, mouthwashes and in drinking water to prevent dental cavities.