1. 67
Holmio – Holmium
Mass: 164.9 u
1s2
2s2
2p6
3s2
3p6
4s2
3d10
4p6
5s2
4d10
5p6
6s2
4f11
Melting point: 1734 K
Boiling point: 2993 K
Density: 8.7 g/cm3
Discovery: Delafontaine & Soret (1878)
Elemental Holmium is a relatively soft and malleable silvery-
white metal. It is too reactive to be found uncombined in nature,
but when isolated, is relatively stable in dry air at room
temperature.