96 - Curium actinide
Discovered by Glenn Seaborg in 1944
Curium is a transuranic radioactive chemical element with symbol Cm and atomic number 96. This element of the actinide series was named after Marie and Pierre Curie – both were known for their research on radioactivity. Curium was first intentionally produced and identified in July 1944 by the group of Glenn T. Seaborg at the University of California, Berkeley.
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 | 25 | 2 in 5s + 6 in 5p + 10 in 5d + 7 in 5f |
| 6 | 9 | 2 in 6s + 6 in 6p + 1 in 6d |
| 7 | 2 | 2 in 7s |
silvery metallic, glows purple in the dark Appearance
247 u Atomic Mass
3.38k K Boiling Point
10 Group
3 Common Oxidation States
1.69 Å Covalent Radius
13.5 g/cm³ Density
27.2 kJ/mol Electron Affinity
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f7 6d1 Electron Configuration
[Rn] 5f7 6d1 7s2 Electron Configuration (semantic)
1.3 Electronegativity
96 Electrons
5.99 eV First Ionization Energy
581 kJ/mol Ionization Energies
1.34k K Melting Point
41 Mendeleev Number
7 Number of Shells
151 Neutrons
96 Atomic Number
133 Number of Isotopes
3, 4 Oxidation States
7 Period
Solid Phase
96 Protons