4  Beryllium

 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      

+--------------------+
|  4  ____           |
|    | __ )  ___     |
|    |  _ \ / _ \    |
|    | |_) |  __/    |
|    |____/ \___|    |
|                    |
|      Beryllium     |
|     9.012183 u     |
+--------------------+

Electron Configuration: [He]2s2
Electronegativity:      1.57
Atomic Radius:          153 pm
Ionization Energy:      9.323 eV
Electron Affinity:      
Oxidation States:       2
Standard State:         Solid
Melting Point:          1560 K
Boiling Point:          2744 K
Density:                1.85 g/cm3
Family:                 Alkaline earth metal
Year Discovered:        1798
Number of Neutrons:     5
Number of Protons:      4
Number of Electrons:    4
Number of Valence:      2
Valency:                2
Group:                  2
Period:                 2
Shell:                  s-shell
Specific Heat:          1.825 J/g K
Radioactive:            0
Occurrence:             Natural
Source:                 Cosmic ray collision