Holmium

67
Ho
Groep
n/a
Periode
6
Blok
f
Protrone
Elektrone
Neutrone
67
67
98
Algemene Eienskappe
Atoom Nommer
67
Atoommassa
164,93032
Massa Nommer
165
Kategorie
Lantaniede
Kleur
Silver
Radioaktief
Nee
From the Latin word Holmia meaning Stockholm
Kristalstruktuur
Eenvoudige seshoekige
Geskiendenis
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.
Elektrone per skil
2, 8, 18, 29, 8, 2
Elektronkonfigurasie
[Xe] 4f11 6s2
Ho
Holmium has the highest magnetic strength of any naturally occurring element
Fisiese Eienskappe
Fase
Soliede
Digtheid
8,795 g/cm3
Smeltpunt
1734,15 K | 1461 °C | 2661,8 °F
Kookpunt
2993,15 K | 2720 °C | 4928 °F
Heat of Fusion
17 kJ/mol
Heat of Vaporization
265 kJ/mol
Spesifieke Hitte Kapasiteit
0,165 J/g·K
Oorvloed in die aardkors
0,00012%
Oorvloed in die heelal
5×10-8%
Ultrapure
Beeld Krediete: Images-of-elements
Ultrapure holmium
CAS Nommer
7440-60-0
PubChem CID Nommer
23988
Atomiese Eienskappe
Atoom radius
176 pm
Kovalente Radius
192 pm
Elektronegatiewiteit
1,23 (Pauling scale)
Ionisasie potensiaal
6,0215 eV
Atoom volume
18,7 cm3/mol
Termiese geleidingsvermoë
0,162 W/cm·K
Oksidasiestate
3
Toepassings
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.
Holmium is considered to be of low toxicity
Isotope
Stabiele Isotope
165Ho
Onstabiele Isotope
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