2  Helium

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

+--------------------+
|  2  _   _          |
|    | | | | ___     |
|    | |_| |/ _ \    |
|    |  _  |  __/    |
|    |_| |_|\___|    |
|                    |
|       Helium       |
|      4.00260 u     |
+--------------------+

Electron Configuration: 1s2
Electronegativity:
Atomic Radius:          140 pm
Ionization Energy:      24.587 eV
Electron Affinity:
Oxidation States:       0
Standard State:         Gas
Melting Point:          0.95 K
Boiling Point:          4.22 K
Density:                0.0001785 g/cm3
Family:                 Noble gas
Year Discovered:        1868
Number of Neutrons:     2
Number of Protons:      2
Number of Electrons:    2
Number of Valence:      2
Valency:                0
Group:                  18
Period:                 1
Shell:                  s-shell
Specific Heat:          5.193 J/g K
Radioactive:            0
Occurrence:             Natural
Source:                 The big bang

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