9 - Fluorine diatomic nonmetal
Discovered by André-Marie Ampère in 1886
Fluorine is a chemical element with symbol F and atomic number 9. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. As the most electronegative element, it is extremely reactive:almost all other elements, including some noble gases, form compounds with fluorine.
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 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
57-71 La-Lu Lanthanides
89-103 Ac-Lr Actinides
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 7 | 2 in 2s + 5 in 2p |
19 u Atomic Mass
0.57 Å Atomic Radius
85 K Boiling Point
0.57 Å Covalent Radius
0.0017 g/cm³ Density
328 Electron Affinity
3.98 Electronegativity
17.4 eV First Ionization Energy
53.6 K Melting Point
2 Number of Shells
7 Electron Valency
9 Atomic Number
2, 7 Electron Shell Occupations
0.824 J/(g K) Specific Heat