Discovered By: Marc Delafontaine, Jacques-Louis Soret, Per Teodor Cleve
Discovery year: 1878

The following table showing some properties of Holmium(Ho):

Table Example
Atomic number 67
Group n/a
Period 6
Block f
Electrons 67
Protons 67
Neutrons 98
Atomic weight 164.93033
Oxidation states +3
Ionic charge Ho^3+


Table Example
Electrons per shell K2 L8 M18 N29 O8 P2
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^11
Atomic radius 226 pm
Covalent radius 192 pm
Boiling point 2700°C
Melting point 1474°C
Neel point 132 K
Phase Solid
Fusion heat 17 kJ.mol^-1
Thermal expansion 1.12*10^-5 K^-1


Table Example
Vaporization heat 265 kJ.mol^-1
Color Silver
Brinell hardness 746 MPa
Bulk modulus 40 GPa
Density 8795 kg.m^-3
Liquid density 8340 kg.m^-3
Mohs hardness 1.6
Poisson ratio 0.23
Shear modulus 26 GPa
Sound speed 2760 m.s^-1


Table Example
Vickers hardness 481 MPa
Young's modulus 65 GPa
Electrical conductivity 1.1*10^6 S.m^-1
Electrical type Conductor
Magnetic type Paramagnetic
Resistivity 9.4*10^-7 Ohm.m
Curie point 20 K
Electronegativity 1.23
Valence 3
Electron affinity 50 kJ.mnol^-1
First ionization energy 581 kJ.mol^-1
Radioactive No
Neutron cross section 65 barn