calcium fluoride

F - Fluorine

The toxic gas, fluorine, is the most reactive element. It was discovered by Karl Scheele in 1771 but not isolated until 1886 when Henri Moissan electrolysed potassium fluoride with some very sophisitcated and expensive equipment. Our students determine fluoride ion concentration in tap water using a selective ion electrode.

Atomic number - 9 Density g/mL 0 .0001696
Atomic weight u 18 .998403 Melting point K 53 .48
Bonding radius A 0 .72 Boiling point K 84 .95
Atomic radius A 0 .57 Heat of vaporization kJ/mol 3 .2698
Ionization Potential V 17 .422 Heat of fusion kJ/mol 0 .2552
Electronegativity - 3 .98 Specific heat J/gK 0 .82
The oxide is a strong acid.
Crystal are cubic.

Electron config. : 1s2 2s2 2p5

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113
Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of F: Click mass number for decay process, product for element page.
014

p,3.200 MeV
O-13
14.036071 		015
1.0 MeV
p,1.480 MeV
O-14
15.018014 		016
40KEV
p,10.539 MeV
O-15
16.011465 		017
64.49 sec
EC,2.761 MeV
O-17
17.002095 		018
109.77 min
EC,1.656 MeV
O-18
18.000937 		019 100%

Stable

18.998403 		020
11.00 sec
B-,7.025 MeV
Ne-20
19.999981
021
4.158 sec
B-,5.684 MeV
Ne-21
20.999948 		022
4.23 sec
B-,10.818 MeV
Ne-22
22.002999 		023
2.23 sec
B-,8.480 MeV
Ne-23
23.003574 		024
0.34 sec
B-,13.490 MeV
Ne-24
24.008094 		025

B-/B-n,2.470
Ne-25/Ne-24
25.012098 		MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/6/98. This is not a publication of Phoenix College.