Cs - Cesium

Cesium was discovered by G. R. Kirchhoff and Robert Bunsen spectroscopicaly in 1860.

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: Click mass number for decay process, product for element page.

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 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 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 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 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 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 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

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 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 148
140 msec
B-/B-n,10.500
Ba-148/Ba-147
147.94900 MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

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

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	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	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	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	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	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	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
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	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	148 140 msec B-/B-n,10.500 Ba-148/Ba-147 147.94900	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass