78  Platinum

 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      

+--------------------+
| 78   ____  _       |
|     |  _ \| |_     |
|     | |_) | __|    |
|     |  __/| |_     |
|     |_|    \__|    |
|                    |
|      Platinum      |
|      195.08 u      |
+--------------------+

Electron Configuration: [Xe]6s1 4f14 5d9
Electronegativity:      2.28
Atomic Radius:          209 pm
Ionization Energy:      9 eV
Electron Affinity:      2.128 eV
Oxidation States:       +4, +2
Standard State:         Solid
Melting Point:          2041.55 K
Boiling Point:          4098 K
Density:                21.46 g/cm3
Family:                 Transition metal
Year Discovered:        1735
Number of Neutrons:     117
Number of Protons:      78
Number of Electrons:    78
Number of Valence:      
Valency:                
Group:                  10
Period:                 6
Shell:                  d-shell
Specific Heat:          0.133 J/g K
Radioactive:            0
Occurrence:             Natural
Source:                 Merging neutron stars