the cesium beam clock from the National Physical Laboratory

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

Top | About | Search | Comment | PC Chemistry

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113
Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

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

Updated by clh on 2/6/98. This is not a publication of Phoenix College.