33 - Arsenic metalloid
Discovered by Bronze Age in 1250
Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. Arsenic is a metalloid.
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 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
57-71 La-Lu Lanthanides
89-103 Ac-Lr Actinides
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 18 | 2 in 3s + 6 in 3p + 10 in 3d |
| 4 | 5 | 2 in 4s + 3 in 4p |
74.9 u Atomic Mass
1.3 Å Atomic Radius
887 K Boiling Point
1.19 Å Covalent Radius
5.73 g/cm³ Density
77.7 Electron Affinity
2.18 Electronegativity
9.79 eV First Ionization Energy
1.09k K Melting Point
4 Number of Shells
5 Electron Valency
33 Atomic Number
2, 8, 18, 5 Electron Shell Occupations
0.329 J/(g K) Specific Heat