53  Iodine

 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      

+--------------------+
| 53      ___        |
|        |_ _|       |
|         | |        |
|         | |        |
|        |___|       |
|                    |
|       Iodine       |
|     126.9045 u     |
+--------------------+

Electron Configuration: [Kr]5s2 4d10 5p5
Electronegativity:      2.66
Atomic Radius:          198 pm
Ionization Energy:      10.451 eV
Electron Affinity:      3.059 eV
Oxidation States:       +7, +5, +1, -1
Standard State:         Solid
Melting Point:          386.85 K
Boiling Point:          457.55 K
Density:                4.93 g/cm3
Family:                 Halogen
Year Discovered:        1811
Number of Neutrons:     74
Number of Protons:      53
Number of Electrons:    53
Number of Valence:      7
Valency:                1
Group:                  17
Period:                 5
Shell:                  p-shell
Specific Heat:          0.214 J/g K
Radioactive:            0
Occurrence:             Natural
Source:                 Merging neutron stars