89  Actinium

 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      

+--------------------+
| 89     _           |
|       / \   ___    |
|      / _ \ / __|   |
|     / ___ \ (__    |
|    /_/   \_\___|   |
|                    |
|      Actinium      |
|     227.02775 u    |
+--------------------+

Electron Configuration: [Rn]7s2 6d1
Electronegativity:      1.1
Atomic Radius:          260 pm
Ionization Energy:      5.17 eV
Electron Affinity:      
Oxidation States:       3
Standard State:         Solid
Melting Point:          1324 K
Boiling Point:          3471 K
Density:                10.07 g/cm3
Family:                 Actinide
Year Discovered:        1899
Number of Neutrons:     138
Number of Protons:      89
Number of Electrons:    89
Number of Valence:      
Valency:                
Group:                  3
Period:                 7
Shell:                  f-shell
Specific Heat:          0.120 J/g K
Radioactive:            1
Occurrence:             Natural
Source:                 Radioactive decay