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Caesium,  ₅₅Cs

Spectral lines of caesium
Ki-pún sèng-chit
Miâ, hû-hō	caesium, Cs
Phian-miâ	cesium
Gōa-hêng	silvery gold
Caesium tī chiu-kî-piáu lāi ê ūi-tì
Rb ↑ Cs ↓ Fr xenon ← caesium → barium
Goân-chú-hoan	55
Goân-chú-liōng (±)	132.90545196(6)[1]
Goân-sò͘ lūi-pia̍t	kiⁿ-kim-sio̍k
Cho̍k, hun-khu	1 cho̍k, s khu
Chiu-kî	tē 6 chiu-kî
Tiān-chú pâi-lia̍t	[Xe] 6s1
per shell	2, 8, 18, 18, 8, 1
Bu̍t-lí sèng-chit
Siòng	kò͘-thé
Iûⁿ-tiám	301.7 K ​(28.5 °C, ​83.3 °F)
Hut-tiám	944 K ​(671 °C, ​1240 °F)
Bi̍t-tō͘  (sek-un)	1.93 g·cm−3
1.843 g·cm−3
Lîm-kài-tiám	1938 K, 9.4 MPa[2]
Iûⁿ-hoà-jia̍t	2.09 kJ·mol−1
Cheng-hoat-jia̍t	63.9 kJ·mol−1
Jia̍t-iông-liōng	32.210 J·mol−1·K−1
cheng-khì-ap P (Pa) 1 10 100 1 k 10 k 100 k tī T (K) 418 469 534 623 750 940
Goân-chú sèng-chit
Sng-hòa-sò͘	+1, −1[3] ​(a strongly basic oxide)
Tiān-hū-tō͘	Pauling scale: 0.79
Tiān-lī-lêng	1st: 375.7 kJ·mol−1 2nd: 2234.3 kJ·mol−1 3rd: 3400 kJ·mol−1
Goân-chú pòaⁿ-kèng	empirical: 265 pm
Kiōng-kè pòaⁿ-kèng	244±11 pm
Van der Waals pòaⁿ-kèng	343 pm
Cha̍p-lio̍k
Chiⁿ-thé kò͘-chō	​body-centered cubic (bcc)
Jia̍t-phòng-tiòng	97 µm·m−1·K−1 (at 25 °C)
Jia̍t-thoân-tō-lu̍t	35.9 W·m−1·K−1
Tiān-chó͘-lu̍t	205 nΩ·m (at 20 °C)
Chû-sèng	paramagnetic[4]
Young hē-sò͘	1.7 GPa
Bulk hē-sò͘	1.6 GPa
Mohs ngē-tō͘	0.2
Brinell ngē-tō͘	0.14 MPa
CAS teng-kì pian-hō	7440-46-2
Le̍k-sú
Hō-miâ	from Latin caesius, sky blue, for its spectral colours
Hoat-hiān	Robert Bunsen and Gustav Kirchhoff (1860)
Siōng chá hû-lî	Carl Setterberg (1882)
Chòe ún-tēng ê tông-ūi-sò͘
Chú bûn-chiong: caesium ê tông-ūi-sò͘
iso NA half-life DM DE (MeV) DP 133Cs 100% – (SF) <34.753 134Cs syn 2.0648 y ε 1.229 134Xe β− 2.059 134Ba 135Cs trace 2.3×106 y β− 0.269 135Ba 137Cs trace 30.17 y[5] β− 1.174 137Ba
Decay modes in parentheses are predicted, but have not yet been observed

Caesium sī 1 ê hoà-ha̍k goân-sò͘. I ê goân-chú-hoan sī 55, hoà-ha̍k hû-hō sī Cs.

• Caesium or Cesium at The Periodic Table of Videos (University of Nottingham)
• View the reaction of Caesium (most reactive metal in the periodic table) with Fluorine (most reactive non-metal) courtesy of The Royal Institution.
• Rogachev, Andrey Yu.; Miao, Mao-Sheng; Merino, Gabriel; Hoffmann, Roald (2015). "Molecular CsF5and CsF2+". Angewandte Chemie. 127 (28): 8393–8396. Bibcode:2015AngCh.127.8393R. doi:10.1002/ange.201500402.