67 - Holmium lanthanide
Discovered by Marc Delafontaine in 1878
Holmium is a chemical element with symbol Ho and atomic number 67. Part of the lanthanide series, holmium is a rare earth element. Holmium was discovered by Swedish chemist Per Theodor Cleve.
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 | 29 | 2 in 4s + 6 in 4p + 10 in 4d + 11 in 4f |
| 5 | 8 | 2 in 5s + 6 in 5p |
| 6 | 2 | 2 in 6s |
silvery white Appearance
165 u Atomic Mass
1.75 Å Atomic Radius
2.99k K Boiling Point
13 Group
3 Common Oxidation States
1.92 Å Covalent Radius
8.79 g/cm³ Density
32.6 kJ/mol Electron Affinity
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f11 Electron Configuration
[Xe] 4f11 6s2 Electron Configuration (semantic)
1.23 Electronegativity
67 Electrons
6.02 eV First Ionization Energy
3 ICSD Oxidation States
581, 1140, 2204, 4100 kJ/mol Ionization Energies
1.74k K Melting Point
23 Mendeleev Number
27.1 J/(mol·K) Molar Heat
6 Number of Shells
98 Neutrons
67 Atomic Number
29 Number of Isotopes
3 Oxidation States
6 Period
Solid Phase
67 Protons
2, 8, 18, 29, 8, 2 Electron Shell Occupations