Holmium
67
Ho
Ryhmä
Ei saatavilla
Jakso
6
Lohko
f
Protonia
Elektronit
Neutronia
67
67
98
Yleiset ominaisuudet
Järjestysluku
67
Atomipaino
164,93032
Massaluku
165
Luokka
Lantanoidit
Väri
Hopea
Radioaktiivisuus
Ei
From the Latin word Holmia meaning Stockholm
Kiderakenne
Yksinkertainen kuusikulmainen
Historia
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.
Elektroneja elektronikuorilla
2, 8, 18, 29, 8, 2
Orbitaalirakenne
[Xe] 4f11 6s2
Holmium has the highest magnetic strength of any naturally occurring element
Fyysiset ominaisuudet
Olomuoto
Kiinteä
Tiheys
8,795 g/cm3
Sulamispiste
1734,15 K | 1461 °C | 2661,8 °F
Kiehumispiste
2993,15 K | 2720 °C | 4928 °F
Sulamislämpö
17 kJ/mol
Höyrystymislämpö
265 kJ/mol
Ominaislämpökapasiteetti
0,165 J/g·K
Esiintyvyys maankuoressa
0,00012%
Esiintyvyys maailmankaikkeudessa
5×10-8%
CAS-numero
7440-60-0
PubChem CID-numero
23988
Atomiominaisuudet
Atomisäde
176 pm
Kovalenttisäde
192 pm
Elektronegatiivisuus
1,23 (Paulingin asteikko)
Ionisoitumispotentiaali
6,0215 eV
Moolitilavuus
18,7 cm3/mol
Lämmönjohtavuus
0,162 W/cm·K
Hapetusluvut
3
Käyttö
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
Isotooppi
Vakaat isotoopit
165HoEpävakaat isotoopit
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