Mendeleev's Periodic Table > Cs - Cesium

Cs - Cesium

Cesium was discovered by G. R. Kirchhoff and Robert Bunsen spectroscopicaly in 1860.
The metal is characterised by a spectrum containing two bright lines in the blue (accounting for its name). It is silvery gold, soft, and ductile. It is the most electropositive and most alkaline element. Cesium, gallium, and mercury are the only three metals that are liquid at or around room temperature. Cesium reacts explosively with cold water, and reacts with ice at temperatures above -116°C. Cesium hydroxide is a strong base and attacks glass.

Atomic number	-	55		Density	g/mL	1	.87
Atomic weight	u	132	.9054	Melting point	K	301	.55
Bonding radius	A	2	.35	Boiling point	K	944
Atomic radius	A	3	.34	Heat of vaporization	kJ/mol	67	.74
Ionization Potential	V	3	.894	Heat of fusion	kJ/mol	2	.092
Electronegativity	-	0	.79	Specific heat	J/gK	0	.24
The oxide is a strong base.				Crystal are body centered cubic.
Electron config. : [Xe] 6s¹

Isotopes of Cs (Cesium):

MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	113 33 usec p Xe-112 112.94451	114 0.57 sec a/EC/ECa/ECp,12.400 I-110/Xe-114/Te-110/I-113 113.94138	115 1.4 sec EC/ECp,8.800 Xe-115/I-114 114.93590	116 0.70 sec EC/ECa/ECp,10.500 Xe-116/Te-112/I-115 115.93301
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	117 8.4 sec EC,7.520 MeV Xe-117 116.92864	118 14 sec EC/ECa/ECp,9.300 Xe-118/Te-114/I-117 117.92653	119 43.0 sec EC,6.330 MeV Xe-119 118.92234	120 57 sec EC/ECp,7.920 Xe-120/I-119 119.92066
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	121 128 sec EC,5.400 MeV Xe-121 120.91717	122 21.0 sec EC,7.050 MeV Xe-122 121.91612	123 5.87 min EC,4.200 MeV Xe-123 122.91298	124 30.9 sec EC,5.917 MeV Xe-124 123.91224
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	125 45 min EC,3.092 MeV Xe-125 124.90971	126 1.63 min EC,4.826 MeV Xe-126 125.90944	127 6.25 hr EC,2.085 MeV Xe-127 126.90741	128 3.66 min EC,3.930 MeV Xe-128 127.90774
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	129 32.06 hr EC,1.196 MeV Xe-129 128.90606	130 29.21 min B-/EC,2.983 Ba-130/Xe-130 129.90671	131 9.689 da EC,7.200 MeV Xe-131 130.90546	132 6.479 da B-/EC,2.120 Ba-132/Xe-132 131.90642
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	133 100% Stable 132.90544	134 2.0648 yr B-/EC,2.059 Ba-134/Xe-134 133.90671	135 2.3E+6 yr B-,5.400 MeV Ba-135 134.90597	136 13.16 da B-,2.548 MeV Ba-136 135.90730
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	136a 19 sec B-,2.548 MeV Ba-136 135.90730	137 30.07 yr B-,1.176 MeV Ba-137 136.90708	138 33.41 min B-,5.373 MeV Ba-138 137.91101	139 9.27 min B-,4.213 MeV Ba-139 138.91335
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	140 63.7 sec B-,6.219 MeV Ba-140 139.91727	141 24.94 sec B-/B-n,5.255 Ba-141/Ba-140 140.92005	142 1.70 sec B-/B-n,7.306 Ba-142/Ba-141 141.92429	143 1.78 sec B-/B-n,6.243 Ba-143/Ba-142 142.92731
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	144 1.01 sec B-/B-n,8.465 Ba-144/Ba-143 143.93202	145 0.594 sec B-/B-n,7.890 Ba-145/Ba-144 144.93541	146 0.321 sec B-/B-n,9.380 Ba-146/Ba-145 145.94024	147 0.235 sec B-/B-n,9.250 Ba-147/Ba-146 146.94392
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	148 140 msec B-/B-n,10.500 Ba-148/Ba-147 147.94900

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