Holmium

67
Ho
Kumpulan
Tiada
Kala
6
Blok
f
Proton
Elektron
Neutron
67
67
98
Ciri-Ciri Am
Nombor atom
67
Berat atom
164.93032
Nombor jisim
165
Kategori
Lantanid
Warna
Perak
Radioaktif
Tidak
From the Latin word Holmia meaning Stockholm
Struktur hablur
Hexagonal Ringkas
Sejarah
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.
Bilangan elektron per petala
2, 8, 18, 29, 8, 2
Konfigurasi elektron
[Xe] 4f11 6s2
Ho
Holmium has the highest magnetic strength of any naturally occurring element
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
8.795 g/cm3
Takat lebur
1734.15 K | 1461 °C | 2661.8 °F
Takat didih
2993.15 K | 2720 °C | 4928 °F
Haba pelakuran
17 kJ/mol
Haba pengewapan
265 kJ/mol
Muatan haba molar
0.165 J/g·K
Banyak pada kerak bumi
0.00012%
Banyak pada alam semesta
5×10-8%
Ultrapure
Kredit imej: Images-of-elements
Ultrapure holmium
Nombor CAS
7440-60-0
PubChem CID Number
23988
Ciri-Ciri Atom
Jejari atom
176 pm
Jejari kovalen
192 pm
Keelektronegatifan
1.23 (Skala Pauling)
Kebolehan mengion
6.0215 eV
Isipadu atom
18.7 cm3/mol
Daya pengaliran terma
0.162 W/cm·K
Keadaan pengoksidaan
3
Aplikasi
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
Isotop
Isotop stabil
165Ho
Isotop tidak stabil
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