Barium

Barium he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì Ba, ngièn-chṳ́ su-muk he 56.

Barium,  ₅₆Ba

ngoi-kôn
silvery gray; with a pale yellow tint
Kî-pún sin-sit
Miàng, fù-ho	barium, Ba
ngoi-hìn	silvery gray; with a pale yellow tint
Barium chhai chû-khì-péu ke vi-chi
Sr ↑ Ba ↓ Ra caesium ← barium → lanthanum
ngièn-chṳ́ sì-sú	56
ngièn-chṳ́-liòng (±)	137.327(7)
ngièn-su lui-phe̍t	kán-thú kîm-su̍k
Chhu̍k, fûn-khî	2 chhu̍k, s-block
chû-khì	period 6
thien-chṳ́ phài-lie̍t	[Xe] 6s2
per shell	2, 8, 18, 18, 8, 2
vu̍t-lî sin-chṳt
Siông	ku-thí
yùng-tiám	1000 K ​(727 °C, ​1341 °F)
pui-tiám	2118 K ​(1845 °C, ​3353 °F)
Me̍t-thu near Sit-vûn	3.51 g·cm−3
3.338 g·cm−3
Yùng-fa-ngie̍t	7.12 kJ·mol−1
Chîn-fat-ngie̍t	142 kJ·mol−1
Ngie̍t-yùng-liong	28.07 J·mol−1·K−1
chîn-hi-ap P (Pa) 1 10 100 1 k 10 k 100 k chhai T (K) 911 1038 1185 1388 1686 2170
Ngièn-chṳ́ sin-chṳt
Yông-fa-su	+2, +1 ​(a strongly basic oxide)
Thien-fu-sin	Pauling scale: 0.89
Thien-lì-nèn	1st: 502.9 kJ·mol−1 2nd: 965.2 kJ·mol−1 3rd: 3600 kJ·mol−1
Ngièn-chṳ́ pan-kang	empirical: 222 pm
Khiung-ka pan-kang	215±11 pm
Van der Waals pan-kang	268 pm
Miscellanea
Chîn-thí keu-chho	​body-centered cubic (bcc)
Sâng-suk thin rod	1620 m·s−1 (at 20 °C)
Ngie̍t-phàng-chong	20.6 µm·m−1·K−1 (at 25 °C)
Ngie̍t-chhòn-thô-li̍t	18.4 W·m−1·K−1
Thien-chú-li̍t	332 nΩ·m (at 20 °C)
Chhṳ̀-sin	paramagnetic
Young's modulus	13 GPa
Shear modulus	4.9 GPa
Bulk modulus	9.6 GPa
Mohs hardness	1.25
CAS Registry Number	7440-39-3
Le̍k-sú
Fat-hien	Carl Wilhelm Scheele (1772)
First isolation	Humphry Davy (1808)
Chui vún-thin ke thùng-vi-su
Chú vùn-chông: barium ke thùng-vi-su
iso NA half-life DM DE (MeV) DP 130Ba 0.106% (0.5–2.7)×1021 y εε 2.620 130Xe 132Ba 0.101% >3×1020 y (β+β+) 0.846 132Xe 133Ba syn 10.51 y ε 0.517 133Cs 134Ba 2.417% – (SF) <40.520 135Ba 6.592% – (SF) <39.357 136Ba 7.854% – (SF) <38.041 137Ba 11.23% – (SF) <35.722 138Ba 71.7% – (SF) <34.302
Decay modes in parentheses are predicted, but have not yet been observed