Fluorine
Table:
Fluorine
Pronunciation

/ˈflʊəriːn, -ɪn, -aɪn/
(FLOOR-een, -⁠in, -⁠yn)
/ˈflɔːriːn, -ɪn, -aɪn/
(FLOR-een, -⁠in, -⁠yn)

Allotropes	alpha, beta
Appearance	gas: very pale yellow
liquid: bright yellow
solid: alpha is opaque, beta is transparent
Standard atomic weight Ar, std(F)	18.998403163(6)
Atomic number (Z)	9
Group	group 17 (halogens)
Period	period 2
Block	p-block
Element category	Reactive nonmetal
Electron configuration	[He] 2s2 2p5

Electrons per shell

2, 7
Phase at 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, ​90 kPa
Critical point	144.41 K, 5.1724 MPa
Heat of vaporization	6.51 kJ/mol
Molar heat capacity	Cp: 31 J/(mol·K) (at 21.1 °C)
Cv: 23 J/(mol·K) (at 21.1 °C)
Oxidation states	−1 (oxidizes oxygen)
Electronegativity	Pauling scale: 3.98
Ionization energies

1st: 1681 kJ/mol
2nd: 3374 kJ/mol
3rd: 6147 kJ/mol
(more)

Covalent radius	64 pm
Van der Waals radius	135 pm
Natural occurrence	primordial
Thermal conductivity	0.02591 W/(m·K)
Magnetic ordering	diamagnetic (−1.2×10−4)
CAS Number	7782-41-4
Naming	after the mineral fluorite, itself named after Latin fluo (to flow, in smelting)
Discovery	André-Marie Ampère (1810)
First isolation	Henri Moissan (June 26, 1886)
Named by	Humphry Davy

Looking at the table, decide if the statement is entailed, neutral, or refuted by the data. Conclude with JSON {"answer": "YOUR ANSWER"} — nothing else.

Assertion: Flourine was one of the first ten elements discovered.

answer: entailed