8  Oxygen

 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 Ds Rg Cn Nh Fl Mc Lv Ts Og
                                                      
       Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu      
       Th Pa U  Np Pu Am Cm Bk Cf Es Fm Md No Lr      

+--------------------+
|  8      ___        |
|        / _ \       |
|       | | | |      |
|       | |_| |      |
|        \___/       |
|                    |
|       Oxygen       |
|      15.999 u      |
+--------------------+

Electron Configuration: [He]2s2 2p4
Electronegativity:      3.44
Atomic Radius:          152 pm
Ionization Energy:      13.618 eV
Electron Affinity:      1.461 eV
Oxidation States:       -2
Standard State:         Gas
Melting Point:          54.36 K
Boiling Point:          90.2 K
Density:                0.001429 g/cm3
Family:                 Nonmetal
Year Discovered:        1774
Number of Neutrons:     8
Number of Protons:      8
Number of Electrons:    8
Number of Valence:      6
Valency:                2
Group:                  16
Period:                 2
Shell:                  p-shell
Specific Heat:          0.918 J/g K
Radioactive:            0
Occurrence:             Natural
Source:                 Dying high-mass stars