69  Thulium

 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      

+--------------------+
| 69_____            |
|  |_   _| __ ___    |
|    | || '_ ` _ \   |
|    | || | | | | |  |
|    |_||_| |_| |_|  |
|                    |
|       Thulium      |
|     168.93422 u    |
+--------------------+

Electron Configuration: [Xe]6s2 4f13
Electronegativity:      1.25
Atomic Radius:          227 pm
Ionization Energy:      6.184 eV
Electron Affinity:      
Oxidation States:       3
Standard State:         Solid
Melting Point:          1818 K
Boiling Point:          2223 K
Density:                9.32 g/cm3
Family:                 Lanthanide
Year Discovered:        1879
Number of Neutrons:     100
Number of Protons:      69
Number of Electrons:    69
Number of Valence:      
Valency:                
Group:                  
Period:                 6
Shell:                  f-shell
Specific Heat:          0.160 J/g K
Radioactive:            0
Occurrence:             Natural
Source:                 Merging neutron stars