Chromium

Chromium (Hon-ngî: 鉻 gè) he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì Cr, ngièn-chṳ́ su-muk he 24.

Chromium,  ₂₄Cr

ngoi-kôn
gîn-á khoán kim-sio̍k kiat-chiⁿ
Kî-pún sin-sit
Miàng, fù-ho	Chromium, Cr
ngoi-hìn	gîn-á khoán kim-sio̍k
Chromium chhai chû-khì-péu ke vi-chi
– ↑ Cr ↓ Mo vanadium ← Chromium → manganese
ngièn-chṳ́ sì-sú	24
ngièn-chṳ́-liòng (±)	51.9961(6)
ngièn-su lui-phe̍t	ko-thu kîm-su̍k
Chhu̍k, fûn-khî	6 chhu̍k, d-block
chû-khì	period 4
thien-chṳ́ phài-lie̍t	[Ar] 3d5 4s1
per shell	2, 8, 13, 1
vu̍t-lî sin-chṳt
Siông	ku-thí
yùng-tiám	2180 K ​(1907 °C, ​3465 °F)
pui-tiám	2944 K ​(2671 °C, ​4840 °F)
Me̍t-thu near Sit-vûn	7.19 g·cm−3
6.3 g·cm−3
Yùng-fa-ngie̍t	21.0 kJ·mol−1
Chîn-fat-ngie̍t	347 kJ·mol−1
Ngie̍t-yùng-liong	23.35 J·mol−1·K−1
chîn-hi-ap P (Pa) 1 10 100 1 k 10 k 100 k chhai T (K) 1656 1807 1991 2223 2530 2942
Ngièn-chṳ́ sin-chṳt
Yông-fa-su	6, 5, 4, 3, 2, 1, −1, −2, −4 ​(depending on the oxidation state, an acidic, basic, or amphoteric oxide)
Thien-fu-sin	Pauling scale: 1.66
Thien-lì-nèn	1st: 652.9 kJ·mol−1 2nd: 1590.6 kJ·mol−1 3rd: 2987 kJ·mol−1 (more)
Ngièn-chṳ́ pan-kang	empirical: 128 pm
Khiung-ka pan-kang	139±5 pm
Miscellanea
Chîn-thí keu-chho	​body-centered cubic (bcc)
Sâng-suk thin rod	5940 m·s−1 (at 20 °C)
Ngie̍t-phàng-chong	4.9 µm·m−1·K−1 (at 25 °C)
Ngie̍t-chhòn-thô-li̍t	93.9 W·m−1·K−1
Thien-chú-li̍t	125 nΩ·m (at 20 °C)
Chhṳ̀-sin	antiferromagnetic (rather: SDW)
Young's modulus	279 GPa
Shear modulus	115 GPa
Bulk modulus	160 GPa
Poisson ratio	0.21
Vickers hardness	1060 MPa
Brinell hardness	687–6500 MPa
CAS Registry Number	7440-47-3
Le̍k-sú
Hoat-kiàn kap siōng chá ê tông-ūi-sò͘	Louis Nicolas Vauquelin (1797, 1798)
Chui vún-thin ke thùng-vi-su
Chú vùn-chông: Chromium ke thùng-vi-su
iso NA half-life DM DE (MeV) DP 50Cr 4.345% >1.3×1018 y (β+β+) 1.167 50Ti 51Cr syn 27.7025 d ε – 51V γ 0.320 – 52Cr 83.789% 52Cr is stable with 28 neutrons 53Cr 9.501% 53Cr is stable with 29 neutrons 54Cr 2.365% 54Cr is stable with 30 neutrons
Decay modes in parentheses are predicted, but have not yet been observed