Lanthanum

Lanthanum sī 1 ê hoà-ha̍k goân-sò͘. I ê goân-chú-hoan sī 57, hoà-ha̍k hû-hō sī La.

Lanthanum,  ₅₇La

Ki-pún sèng-chit
Miâ, hû-hō	lanthanum, La
Gōa-hêng	silvery white
Lanthanum tī chiu-kî-piáu lāi ê ūi-tì
– ↑ La ↓ Ac barium ← lanthanum → cerium
Goân-chú-hoan	57
Goân-chú-liōng (±)	138.90547(7)
Goân-sò͘ lūi-pia̍t	lanthanum-hē sometimes considered a transition metal
Cho̍k, hun-khu	n/a, f khu
Chiu-kî	tē 6 chiu-kî
Tiān-chú pâi-lia̍t	[Xe] 5d1 6s2
per shell	2, 8, 18, 18, 9, 2
Bu̍t-lí sèng-chit
Siòng	kò͘-thé
Iûⁿ-tiám	1193 K ​(920 °C, ​1688 °F)
Hut-tiám	3737 K ​(3464 °C, ​6267 °F)
Bi̍t-tō͘  (sek-un)	6.162 g·cm−3
5.94 g·cm−3
Iûⁿ-hoà-jia̍t	6.20 kJ·mol−1
Cheng-hoat-jia̍t	400 kJ·mol−1
Jia̍t-iông-liōng	27.11 J·mol−1·K−1
cheng-khì-ap (extrapolated) P (Pa) 1 10 100 1 k 10 k 100 k tī T (K) 2005 2208 2458 2772 3178 3726
Goân-chú sèng-chit
Sng-hòa-sò͘	3, 2, 1 ​(a strongly basic oxide)
Tiān-hū-tō͘	Pauling scale: 1.10
Tiān-lī-lêng	1st: 538.1 kJ·mol−1 2nd: 1067 kJ·mol−1 3rd: 1850.3 kJ·mol−1
Goân-chú pòaⁿ-kèng	empirical: 187 pm
Kiōng-kè pòaⁿ-kèng	207±8 pm
Cha̍p-lio̍k
Chiⁿ-thé kò͘-chō	​double hexagonal close-packed (dhcp)
Siaⁿ-sok (sòe kùn-á)	2475 m·s−1 (at 20 °C)
Jia̍t-phòng-tiòng	α, poly: 12.1 µm·m−1·K−1 (at r.t.)
Jia̍t-thoân-tō-lu̍t	13.4 W·m−1·K−1
Tiān-chó͘-lu̍t	α, poly: 615 nΩ·m (at r.t.)
Chû-sèng	paramagnetic
Young hē-sò͘	α form: 36.6 GPa
Shear hē-sò͘	α form: 14.3 GPa
Bulk hē-sò͘	α form: 27.9 GPa
Poisson pí	α form: 0.280
Mohs ngē-tō͘	2.5
Vickers ngē-tō͘	360–1750 MPa
Brinell ngē-tō͘	350–400 MPa
CAS teng-kì pian-hō	7439-91-0
Le̍k-sú
Hoat-hiān	Carl Gustaf Mosander (1838)
Chòe ún-tēng ê tông-ūi-sò͘
Chú bûn-chiong: lanthanum ê tông-ūi-sò͘
iso NA half-life DM DE (MeV) DP 137La syn 6×104 y ε 0.600 137Ba 138La 0.090% 1.05×1011 y ε 1.737 138Ba β− 1.044 138Ce 139La 99.910% – (SF) <38.944
Decay modes in parentheses are predicted, but have not yet been observed