Holmium
67
Ho
Gruppe
I/T
Periode
6
Blokk
f
Protoner
Elektroner
Nøytroner
67
67
98
Generelle egenskaper
Atomnummer
67
Atomvekt
164,93032
Massetall
165
Kategori
Lantanoider
Farge
Sølv
Radioaktiv
Nei
From the Latin word Holmia meaning Stockholm
Krystallstruktur
Simple Hexagonal
Historie
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.
Elektroner per energinivå
2, 8, 18, 29, 8, 2
Elektronkonfigurasjon
[Xe] 4f11 6s2
Holmium has the highest magnetic strength of any naturally occurring element
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
8,795 g/cm3
Smeltepunkt
1734,15 K | 1461 °C | 2661,8 °F
Kokepunkt
2993,15 K | 2720 °C | 4928 °F
Smeltevarme
17 kJ/mol
Fordampningsvarme
265 kJ/mol
Spesifikk varmekapasitet
0,165 J/g·K
Forekomst i jordskorpa
0,00012%
Forekomst i universet
5×10-8%
CAS Number
7440-60-0
PubChem CID Number
23988
Atomegenskaper
Atomradius
176 pm
Kovalent radius
192 pm
Elektronegativitet
1,23 (Pauling-skalaen)
Ioniseringsenergi
6,0215 eV
Molart volum
18,7 cm3/mol
Termisk ledningsevne
0,162 W/cm·K
Oksidasjonstilstander
3
Bruksområder
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
Isotoper
Stabile isotoper
165HoUstabile isotoper
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