Holmyo

Holmium
67Ho
- ↑ Ho ↓ Es Periodic table dysprosium ← holmium → erbium
Appearance
silvery white
General properties
Name, simbolo, kaiphan	holmium, Ho, 67
Pronunciation	Plantilya:IPAc-en Plantilya:Respell
Element category	puthaw nga lantanido
Group, period, block	n/a, 6, f
Standard atomic weight	164.93032
Electron configuration	[Xe] 4f11 6s2 2, 8, 18, 29, 8, 2
History
Discovery	Marc Delafontaine (1878)
Physical properties
Phase	magahi
Density (near r.t.)	8.79 g·cm−3
Liquid density at m.p.	8.34 g·cm−3
Melting point	1734 K, 1461 °C, 2662 °F
Boiling point	2993 K, 2720 °C, 4928 °F
Heat of fusion	17.0 kJ·mol−1
Heat of vaporization	265 kJ·mol−1
Molar heat capacity	27.15 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1432 1584 (1775) (2040) (2410) (2964)
Atomic properties
Oxidation states	3, 2, 1 (basic oxide)
Electronegativity	1.23 (Pauling scale)
Ionization energies	1st: 581.0 kJ·mol−1
	2nd: 1140 kJ·mol−1
	3rd: 2204 kJ·mol−1
Atomic radius	176 pm
Covalent radius	192±7 pm
Miscellanea
Crystal structure	hexagonal
Magnetic ordering	paramagnetic
Electrical resistivity	(r.t.) (poly) 814 nΩ·m
Thermal conductivity	16.2 W·m−1·K−1
Thermal expansion	(r.t.) (poly) 11.2 µm/(m·K)
Speed of sound (thin rod)	(20 °C) 2760 m·s−1
Young's modulus	64.8 GPa
Shear modulus	26.3 GPa
Bulk modulus	40.2 GPa
Poisson ratio	0.231
Vickers hardness	481 MPa
Brinell hardness	746 MPa
CAS registry number	7440-60-0
Most stable isotopes
Main article: Isotopes of holmium
iso NA half-life DM DE (MeV) DP 163Ho syn 4570 yr ε 0.003 163Dy 164Ho syn 29 min ε 0.987 164Dy 165Ho 100% 165Ho is stable with 98 neutrons 166Ho syn 26.763 h β− 1.855 166Er 167Ho syn 3.1 h β− 1.007 167Er

Ang holmyo (Iningles holmium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Ho ug kaiphan nga atomik 67. Ang holmyo mao ang puthaw nga lantanido.

Galeriya sa hulagway

• 
• 
• 
• 
• 
•