Cirkonyo

Ang cirkonyo (Iningles zirconium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Zr ug kaiphan nga atomik 40. Ang cirkonyo mao ang puthaw nga transisyon.

Zirconium
40Zr
Ti ↑ Zr ↓ Hf Periodic table yttrium ← zirconium → niobium
Panagway
silvery white
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	zirconium, Zr, 40
Paglitok	/zərˈkoʊniəm/ [[Help:Pronunciation respelling key|zər-Plantilya:Smallcaps all-ni-əm]]
Kategoriyang elemento	puthaw nga transisyon
Group, period, block	4, 5, d
Gibug-aton sa atomo	91.224
Kontorno sa elektron	[Kr] 5s2 4d2 2, 8, 18, 10, 2
History
Pagkadiskobre	Martin Heinrich Klaproth (1789)
First isolation	Jöns Jakob Berzelius (1824)
Physical properties
Phase	magahi
Density (near r.t.)	6.52 g·cm−3
Liquid density at m.p.	5.8 g·cm−3
Melting point	2128 K, 1855 °C, 3371 °F
Boiling point	4682 K, 4409 °C, 7968 °F
Heat of fusion	14 kJ·mol−1
Heat of vaporization	573 kJ·mol−1
Molar heat capacity	25.36 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 2639 2891 3197 3575 4053 4678
Atomic properties
Oxidation states	4, 3, 2, 1[1] (amphoteric oxide)
Electronegativity	1.33 (Pauling scale)
Ionization energies	1st: 640.1 kJ·mol−1
	2nd: 1270 kJ·mol−1
	3rd: 2218 kJ·mol−1
Atomic radius	160 pm
Covalent radius	175±7 pm
Miscellanea
Crystal structure	hexagonal close-packed
Magnetic ordering	paramagnetic[2]
Electrical resistivity	(20 °C) 421 nΩ·m
Thermal conductivity	22.6 W·m−1·K−1
Thermal expansion	(25 °C) 5.7 µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 3800 m·s−1
Young's modulus	88 GPa
Shear modulus	33 GPa
Bulk modulus	91.1 GPa
Poisson ratio	0.34
Mohs hardness	5.0
Vickers hardness	903 MPa
Brinell hardness	650 MPa
CAS registry number	7440-67-7
Most stable isotopes
Main article: Isotopes of zirconium
iso NA half-life DM DE (MeV) DP 88Zr syn 83.4 d ε - 88Y γ 0.392D - 89Zr syn 78.4 h ε - 89Y β+ 0.902 89Y γ 0.909D - 90Zr 51.45% 90Zr is stable with 50 neutrons 91Zr 11.22% 91Zr is stable with 51 neutrons 92Zr 17.15% 92Zr is stable with 52 neutrons 93Zr trace 1.53×106 y β− 0.060 93Nb 94Zr 17.38% >1.1×1017 y β−β− 1.144 94Mo 96Zr 2.8% 2.0×1019 y[3] β−β− 3.348 96Mo
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