Joseph henri moissan 1886 morgan
[MEMRES-5].
Fluorine
Not to be confused with Florin, Fluorene, Fluoride, Fluorone, or Florine.
Chemical element with atomic number 9 (F)
Liquid fluorine (F2 at extremely low temperature) | |
| Pronunciation | |
|---|---|
| Allotropes | alpha, beta (see Allotropes of fluorine) |
| Appearance | gas: very pale yellow liquid: bright yellow solid: alpha is opaque, beta is transparent |
| Atomic number(Z) | 9 |
| Group | group 17 (halogens) |
| Period | period 2 |
| Block | p-block |
| Electron configuration | [He] 2s2 2p5 |
| Electrons per shell | 2, 7 |
| Phaseat STP | gas |
| Melting point | (F2) 53.48 K (−219.67 °C, −363.41 °F) |
| Boiling point | (F2) 85.03 K (−188.11 °C, −306.60 °F) |
| Density (at STP) | 1.696 g/L |
| when liquid (at b.p.) | 1.505 g/cm3 |
| Triple point | 53.48 K, .252 kPa[7] |
| Critical point
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