56  Barium

 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      

+--------------------+
| 56  ____           |
|    | __ )  __ _    |
|    |  _ \ / _` |   |
|    | |_) | (_| |   |
|    |____/ \__,_|   |
|                    |
|       Barium       |
|      137.33 u      |
+--------------------+

Electron Configuration: [Xe]6s2
Electronegativity:      0.89
Atomic Radius:          268 pm
Ionization Energy:      5.212 eV
Electron Affinity:      
Oxidation States:       2
Standard State:         Solid
Melting Point:          1000 K
Boiling Point:          2170 K
Density:                3.62 g/cm3
Family:                 Alkaline earth metal
Year Discovered:        1808
Number of Neutrons:     81
Number of Protons:      56
Number of Electrons:    56
Number of Valence:      2
Valency:                2
Group:                  2
Period:                 6
Shell:                  s-shell
Specific Heat:          0.204 J/g K
Radioactive:            0
Occurrence:             Natural
Source:                 Dying low-mass stars