Làn (Fa-ho̍k ngièn-su)

Làn 鑭,  ₅₇La

ngoi-kôn
silvery white
Kî-pún sin-sit
Miàng, fù-ho	Làn 鑭, La
ngoi-hìn	silvery white
Làn 鑭 chhai chû-khì-péu ke vi-chi
– ↑ La ↓ Ac barium ← Làn 鑭 → cerium
ngièn-chṳ́ sì-sú	57
ngièn-chṳ́-liòng (±)	138.90547(7)
ngièn-su lui-phe̍t	lanthanum-hi, sometimes considered a transition metal
Chhu̍k, fûn-khî	n/a, f-block
chû-khì	period 6
thien-chṳ́ phài-lie̍t	[Xe] 5d1 6s2
per shell	2, 8, 18, 18, 9, 2
vu̍t-lî sin-chṳt
Siông	ku-thí
yùng-tiám	1193 K ​(920 °C, ​1688 °F)
pui-tiám	3737 K ​(3464 °C, ​6267 °F)
Me̍t-thu near Sit-vûn	6.162 g·cm−3
5.94 g·cm−3
Yùng-fa-ngie̍t	6.20 kJ·mol−1
Chîn-fat-ngie̍t	400 kJ·mol−1
Ngie̍t-yùng-liong	27.11 J·mol−1·K−1
chîn-hi-ap (extrapolated) P (Pa) 1 10 100 1 k 10 k 100 k chhai T (K) 2005 2208 2458 2772 3178 3726
Ngièn-chṳ́ sin-chṳt
Yông-fa-su	3, 2, 1 ​(a strongly basic oxide)
Thien-fu-sin	Pauling scale: 1.10
Thien-lì-nèn	1st: 538.1 kJ·mol−1 2nd: 1067 kJ·mol−1 3rd: 1850.3 kJ·mol−1
Ngièn-chṳ́ pan-kang	empirical: 187 pm
Khiung-ka pan-kang	207±8 pm
Miscellanea
Chîn-thí keu-chho	​double hexagonal close-packed (dhcp)
Sâng-suk thin rod	2475 m·s−1 (at 20 °C)
Ngie̍t-phàng-chong	α, poly: 12.1 µm·m−1·K−1 (at r.t.)
Ngie̍t-chhòn-thô-li̍t	13.4 W·m−1·K−1
Thien-chú-li̍t	α, poly: 615 nΩ·m (at r.t.)
Chhṳ̀-sin	paramagnetic
Young's modulus	α form: 36.6 GPa
Shear modulus	α form: 14.3 GPa
Bulk modulus	α form: 27.9 GPa
Poisson ratio	α form: 0.280
Mohs hardness	2.5
Vickers hardness	360–1750 MPa
Brinell hardness	350–400 MPa
CAS Registry Number	7439-91-0
Le̍k-sú
Fat-hien	Carl Gustaf Mosander (1838)
Chui vún-thin ke thùng-vi-su
Chú vùn-chông: Làn 鑭 ke thùng-vi-su
iso NA half-life DM DE (MeV) DP 137La syn 6×104 y ε 0.600 137Ba 139La 99.910% – (SF) <38.944
Decay modes in parentheses are predicted, but have not yet been observed

Làn (鑭) he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì La, ngièn-chṳ́ su-muk he 57.