27  Cobalt

 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      

+--------------------+
| 27   ____          |
|     / ___|___      |
|    | |   / _ \     |
|    | |__| (_) |    |
|     \____\___/     |
|                    |
|       Cobalt       |
|     58.93319 u     |
+--------------------+

Electron Configuration: [Ar]4s2 3d7
Electronegativity:      1.88
Atomic Radius:          192 pm
Ionization Energy:      7.881 eV
Electron Affinity:      0.661 eV
Oxidation States:       +3, +2
Standard State:         Solid
Melting Point:          1768 K
Boiling Point:          3200 K
Density:                8.86 g/cm3
Family:                 Transition metal
Year Discovered:        1735
Number of Neutrons:     32
Number of Protons:      27
Number of Electrons:    27
Number of Valence:      
Valency:                
Group:                  9
Period:                 4
Shell:                  d-shell
Specific Heat:          0.421 J/g K
Radioactive:            0
Occurrence:             Natural
Source:                 White dwarf supernovae