Ko (Fa-ho̍k ngièn-su)

Ko 鋯,  ₄₀Zr

ngoi-kôn
silvery white
Kî-pún sin-sit
Miàng, fù-ho	Ko 鋯, Zr
ngoi-hìn	silvery white
Ko 鋯 chhai chû-khì-péu ke vi-chi
Ti ↑ Zr ↓ Hf yttrium ← Ko 鋯 → niobium
ngièn-chṳ́ sì-sú	40
ngièn-chṳ́-liòng (±)	91.224(2)
ngièn-su lui-phe̍t	ko-thu kîm-su̍k
Chhu̍k, fûn-khî	4 chhu̍k, d-block
chû-khì	period 5
thien-chṳ́ phài-lie̍t	[Kr] 4d2 5s2
per shell	2, 8, 18, 10, 2
vu̍t-lî sin-chṳt
Siông	ku-thí
yùng-tiám	2128 K ​(1855 °C, ​3371 °F)
pui-tiám	4650 K ​(4377 °C, ​7911 °F)
Me̍t-thu near Sit-vûn	6.52 g·cm−3
5.8 g·cm−3
Yùng-fa-ngie̍t	14 kJ·mol−1
Chîn-fat-ngie̍t	591 kJ·mol−1
Ngie̍t-yùng-liong	25.36 J·mol−1·K−1
chîn-hi-ap P (Pa) 1 10 100 1 k 10 k 100 k chhai T (K) 2639 2891 3197 3575 4053 4678
Ngièn-chṳ́ sin-chṳt
Yông-fa-su	4, 3, 2, 1, −2 ​(an amphoteric oxide)
Thien-fu-sin	Pauling scale: 1.33
Thien-lì-nèn	1st: 640.1 kJ·mol−1 2nd: 1270 kJ·mol−1 3rd: 2218 kJ·mol−1
Ngièn-chṳ́ pan-kang	empirical: 160 pm
Khiung-ka pan-kang	175±7 pm
Miscellanea
Chîn-thí keu-chho	​hexagonal close-packed (hcp)
Sâng-suk thin rod	3800 m·s−1 (at 20 °C)
Ngie̍t-phàng-chong	5.7 µm·m−1·K−1 (at 25 °C)
Ngie̍t-chhòn-thô-li̍t	22.6 W·m−1·K−1
Thien-chú-li̍t	421 nΩ·m (at 20 °C)
Chhṳ̀-sin	paramagnetic
Young's modulus	88 GPa
Shear modulus	33 GPa
Bulk modulus	91.1 GPa
Poisson ratio	0.34
Mohs hardness	5.0
Vickers hardness	820–1800 MPa
Brinell hardness	638–1880 MPa
CAS Registry Number	7440-67-7
Le̍k-sú
Hí-miàng	after zircon, zargun زرگون meaning "gold-colored".
Fat-hien	Martin Heinrich Klaproth (1789)
First isolation	Jöns Jakob Berzelius (1824)
Chui vún-thin ke thùng-vi-su
Chú vùn-chông: Ko 鋯 ke thùng-vi-su
iso NA half-life DM DE (MeV) DP 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
Decay modes in parentheses are predicted, but have not yet been observed

Ko (鋯) he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì Zr, ngièn-chṳ́ su-muk he 40.