Holmium
67
Ho
Groep
n.v.t.
Periode
6
Blok
f
Protonen
Elektronen
Neutronen
67
67
98
Algemene Eigenschappen
Atoomnummer
67
Atomair gewicht
164,93032
Massa Getal
165
Categorie
Lanthaniden
Kleur
Zilver
Radioactief
Nee
From the Latin word Holmia meaning Stockholm
Kristalstructuur
Eenvoudige Hexagonaal
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.
Eletronen per schil
2, 8, 18, 29, 8, 2
Electronconfiguratie
[Xe] 4f11 6s2
Holmium has the highest magnetic strength of any naturally occurring element
Fysieke Eigenschappen
Fase
Vast
Dichtheid
8,795 g/cm3
Smeltpunt
1734,15 K | 1461 °C | 2661,8 °F
Kookpunt
2993,15 K | 2720 °C | 4928 °F
Fusiewarmte
17 kJ/mol
Verdampingswarmte
265 kJ/mol
Specifieke Warmtecapaciteit
0,165 J/g·K
Overvloedig aanwezig in de aardkorst
0,00012%
Overvloedig aanwezig in het universum
5×10-8%
CAS-nummer
7440-60-0
PubChem CID nummer
23988
Atoomeigenschappen
Atoomstraal
176 pm
Covalentiestraal
192 pm
Electronegativiteit
1,23 (Pauling schaal)
Ionisatiepotentiaal
6,0215 eV
Atoomvolume
18,7 cm3/mol
Thermische geleiding
0,162 W/cm·K
Oxidatietoestanden
3
Toepassingen
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
Isotopen
Stabiele isotopen
165HoInstabiele isotopen
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