Holmium
67
Ho
Gruppe
i/t
Periode
6
Blokk
f
Proton
Elektron
Nøytron
67
67
98
Generelle eigenskapar
Atomnummer
67
Atommasse
164,93032
Massetal
165
Kategori
Lantanid
Farge
Sølv
Radioaktiv
Nei
From the Latin word Holmia meaning Stockholm
Krystallstruktur
Enkel heksagonal
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.
Elektron per energinivå
2, 8, 18, 29, 8, 2
Elektronkonfigurasjon
[Xe] 4f11 6s2
Holmium has the highest magnetic strength of any naturally occurring element
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
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
Fordampingsvarme
265 kJ/mol
Spesifikk varmekapasitet
0,165 J/g·K
Førekomst i jordskorpa
0,00012%
Førekomst i universet
5×10-8%
CAS-nummer
7440-60-0
PubChem CID-nummer
23988
Atom eigenskapar
Atomradius
176 pm
Kovalent radius
192 pm
Elektronegativitet
1,23 (Paulings skala)
Ioniseringspotensial
6,0215 eV
Molart volum
18,7 cm3/mol
Termisk konduktivitet
0,162 W/cm·K
Oksidasjonstrinn
3
Bruksområde
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
Isotopar
Stabile isotopar
165HoUstabile isotopar
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