77  Iridium

 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      

+--------------------+
| 77   ___           |
|     |_ _|_ __      |
|      | || '__|     |
|      | || |        |
|     |___|_|        |
|                    |
|       Iridium      |
|      192.22 u      |
+--------------------+

Electron Configuration: [Xe]6s2 4f14 5d7
Electronegativity:      2.2
Atomic Radius:          202 pm
Ionization Energy:      9.1 eV
Electron Affinity:      1.565 eV
Oxidation States:       +4, +3
Standard State:         Solid
Melting Point:          2719 K
Boiling Point:          4701 K
Density:                22.42 g/cm3
Family:                 Transition metal
Year Discovered:        1803
Number of Neutrons:     115
Number of Protons:      77
Number of Electrons:    77
Number of Valence:      
Valency:                
Group:                  9
Period:                 6
Shell:                  d-shell
Specific Heat:          0.131 J/g K
Radioactive:            0
Occurrence:             Natural
Source:                 Merging neutron stars