33  Arsenic

 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      

+--------------------+
| 33     _           |
|       / \   ___    |
|      / _ \ / __|   |
|     / ___ \\__ \   |
|    /_/   \_\___/   |
|                    |
|       Arsenic      |
|     74.92159 u     |
+--------------------+

Electron Configuration: [Ar]4s2 3d10 4p3
Electronegativity:      2.18
Atomic Radius:          185 pm
Ionization Energy:      9.815 eV
Electron Affinity:      0.81 eV
Oxidation States:       +5, +3, -3
Standard State:         Solid
Melting Point:          1090 K
Boiling Point:          887 K
Density:                5.776 g/cm3
Family:                 Metalloid
Year Discovered:        Ancient
Number of Neutrons:     42
Number of Protons:      33
Number of Electrons:    33
Number of Valence:      5
Valency:                3
Group:                  15
Period:                 4
Shell:                  p-shell
Specific Heat:          0.329 J/g K
Radioactive:            0
Occurrence:             Natural
Source:                 Dying high-mass stars