5  Boron

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

+--------------------+
|  5     ____        |
|       | __ )       |
|       |  _ \       |
|       | |_) |      |
|       |____/       |
|                    |
|        Boron       |
|       10.81 u      |
+--------------------+

Electron Configuration: [He]2s2 2p1
Electronegativity:      2.04
Atomic Radius:          192 pm
Ionization Energy:      8.298 eV
Electron Affinity:      0.277 eV
Oxidation States:       3
Standard State:         Solid
Melting Point:          2348 K
Boiling Point:          4273 K
Density:                2.37 g/cm3
Family:                 Metalloid
Year Discovered:        1808
Number of Neutrons:     6
Number of Protons:      5
Number of Electrons:    5
Number of Valence:      3
Valency:                3
Group:                  13
Period:                 2
Shell:                  p-shell
Specific Heat:          1.026 J/g K
Radioactive:            0
Occurrence:             Natural
Source:                 Cosmic ray collision

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