84 - Polonium post-transition metal
Discovered by Pierre Curie in 1898
Polonium is a chemical element with symbol Po and atomic number 84, discovered in 1898 by Marie Curie and Pierre Curie. A rare and highly radioactive element with no stable isotopes, polonium is chemically similar to bismuth and tellurium, and it occurs in uranium ores. Applications of polonium are few.
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 | 32 | 2 in 4s + 6 in 4p + 10 in 4d + 14 in 4f |
| 5 | 18 | 2 in 5s + 6 in 5p + 10 in 5d |
| 6 | 6 | 2 in 6s + 4 in 6p |
silvery Appearance
209 u Atomic Mass
1.9 Å Atomic Radius
1.24k K Boiling Point
16 Group
-2, 2, 4 Common Oxidation States
1.4 Å Covalent Radius
9.2 g/cm³ Density
136 kJ/mol Electron Affinity
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p4 Electron Configuration
[Xe] 4f14 5d10 6s2 6p4 Electron Configuration (semantic)
2 Electronegativity
84 Electrons
8.42 eV First Ionization Energy
812.1 kJ/mol Ionization Energies
527 K Melting Point
91 Mendeleev Number
26.4 J/(mol·K) Molar Heat
6 Number of Shells
6 Electron Valency
126 Neutrons
84 Atomic Number
34 Number of Isotopes
-2, 2, 4, 6 Oxidation States
6 Period
Solid Phase
84 Protons
2, 8, 18, 32, 18, 6 Electron Shell Occupations