Holmij
67
Ho
Skupina
n/p
Perioda
6
Blok
f
Protoni
Elektroni
Nevtroni
67
67
98
Splošne lastnosti
Vrstno število
67
Atomska teža
164,93032
Masno število
165
Kategorija
Lantanoidi
Barva
Srebrna
Radioaktivno
Ne
From the Latin word Holmia meaning Stockholm
Kristalna struktura
Heksagonalna
Zgodovina
Holmium was discovered by Swiss chemists Marc Delafontaine and Jacques-Louis Soret in 1878.
They noticed the aberrant spectrographic absorption bands of the then-unknown element.
Later in 1878, Per Teodor Cleve independently discovered the element while he was working on erbia earth.
They noticed the aberrant spectrographic absorption bands of the then-unknown element.
Later in 1878, Per Teodor Cleve independently discovered the element while he was working on erbia earth.
Elektroni po lupinah
2, 8, 18, 29, 8, 2
Razporeditev elektronov
[Xe] 4f11 6s2
Holmium has the highest magnetic strength of any naturally occurring element
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
8,795 g/cm3
Tališče
1734,15 K | 1461 °C | 2661,8 °F
Vrelišče
2993,15 K | 2720 °C | 4928 °F
Talilna toplota
17 kJ/mol
Izparilna toplota
265 kJ/mol
Toplotna kapaciteta
0,165 J/g·K
Zastopanost v Zemljini skorji
0,00012%
Zastopanost v vesolju
5×10-8%
CAS številka
7440-60-0
PubChem CID številka
23988
Atomske lastnosti
Atomski polmer
176 pm
Kovalentni polmer
192 pm
Elektronegativnost
1,23 (Paulingova lestvica)
Ionizacijski potencial
6,0215 eV
Atomski volumen
18,7 cm3/mol
Toplotna prevodnost
0,162 W/cm·K
Oksidacijska stanja
3
Uporabe
Holmium is used to create the strongest artificially generated magnetic fields, when placed within high-strength magnets as a magnetic pole piece.
It is one of the colorants used for cubic zirconia and glass, providing yellow or red coloring.
Holmium isotopes are good neutron absorbers and are used in nuclear reactor control rods.
It is one of the colorants used for cubic zirconia and glass, providing yellow or red coloring.
Holmium isotopes are good neutron absorbers and are used in nuclear reactor control rods.
Holmium is considered to be of low toxicity
Izotopi
Stabilni izotopi
165HoNestabilni izotopi
140Ho, 141Ho, 142Ho, 143Ho, 144Ho, 145Ho, 146Ho, 147Ho, 148Ho, 149Ho, 150Ho, 151Ho, 152Ho, 153Ho, 154Ho, 155Ho, 156Ho, 157Ho, 158Ho, 159Ho, 160Ho, 161Ho, 162Ho, 163Ho, 164Ho, 166Ho, 167Ho, 168Ho, 169Ho, 170Ho, 171Ho, 172Ho, 173Ho, 174Ho, 175Ho