Rubidium

Rubidium,  ₃₇Rb

ngoi-kôn
grey white
Kî-pún sin-sit
Miàng, fù-ho	Rubidium, Rb
ngoi-hìn	grey white
Rubidium chhai chû-khì-péu ke vi-chi
K ↑ Rb ↓ Cs krypton ← Rubidium → strontium
ngièn-chṳ́ sì-sú	37
ngièn-chṳ́-liòng (±)	85.4678(3)
ngièn-su lui-phe̍t	kán-kîm-su̍k
Chhu̍k, fûn-khî	1 chhu̍k, s-block
chû-khì	period 5
thien-chṳ́ phài-lie̍t	[Kr] 5s1
per shell	2, 8, 18, 8, 1
vu̍t-lî sin-chṳt
Siông	ku-thí
yùng-tiám	312.45 K ​(39.30 °C, ​102.74 °F)
pui-tiám	961 K ​(688 °C, ​1270 °F)
Me̍t-thu near Sit-vûn	1.532 g·cm−3
1.46 g·cm−3
Sâm-siong-tiám	312.41 K, ​? kPa
lìm-kie-tiám	2093 K, 16 MPa (extrapolated)
Yùng-fa-ngie̍t	2.19 kJ·mol−1
Chîn-fat-ngie̍t	69 kJ·mol−1
Ngie̍t-yùng-liong	31.060 J·mol−1·K−1
chîn-hi-ap P (Pa) 1 10 100 1 k 10 k 100 k chhai T (K) 434 486 552 641 769 958
Ngièn-chṳ́ sin-chṳt
Yông-fa-su	+1, −1 ​(a strongly basic oxide)
Thien-fu-sin	Pauling scale: 0.82
Thien-lì-nèn	1st: 403 kJ·mol−1 2nd: 2632.1 kJ·mol−1 3rd: 3859.4 kJ·mol−1
Ngièn-chṳ́ pan-kang	empirical: 248 pm
Khiung-ka pan-kang	220±9 pm
Van der Waals pan-kang	303 pm
Miscellanea
Chîn-thí keu-chho	​body-centered cubic (bcc)
Sâng-suk thin rod	1300 m·s−1 (at 20 °C)
Ngie̍t-phàng-chong	90 µm·m−1·K−1 (at r.t.)
Ngie̍t-chhòn-thô-li̍t	58.2 W·m−1·K−1
Thien-chú-li̍t	128 nΩ·m (at 20 °C)
Chhṳ̀-sin	paramagnetic
Young's modulus	2.4 GPa
Bulk modulus	2.5 GPa
Mohs hardness	0.3
Brinell hardness	0.216 MPa
CAS Registry Number	7440-17-7
Le̍k-sú
Fat-hien	Robert Bunsen and Gustav Kirchhoff (1861)
First isolation	George de Hevesy
Chui vún-thin ke thùng-vi-su
Chú vùn-chông: Rubidium ke thùng-vi-su
iso NA half-life DM DE (MeV) DP 83Rb syn 86.2 d ε – 83Kr γ 0.52, 0.53, 0.55 – 84Rb syn 32.9 d ε 84Kr β+ 84Kr γ – β− 84Sr 85Rb 72.17% 85Rb is stable with 48 neutrons 86Rb syn 18.65 d β− 1.775 86Sr γ 1.0767 – 87Rb 27.83% 4.9×1010 y β− 0.283 87Sr

Rubidium (Hon-ngî: 銣 lú) he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì Rb, ngièn-chṳ́ su-muk he 37.