a piece of barium in oil

Ba - Barium

An alkaline earth element, barium is also a toxic heavy metal. Minerals containing barium were identified by Karl Scheele in 1774 from which the pure metal was electrolysed by Humphrey Davy in 1808. Barium is used in our laboratory to demonstrate solubility and conductivity, and in the study of double replacement reactions.

Atomic number - 56 Density g/mL 3 .5

Atomic weight u 137 .33 Melting point K 1002

Bonding radius A 1 .98 Boiling point K 2171

Atomic radius A 2 .78 Heat of vaporization kJ/mol 142

Ionization Potential V 5 .212 Heat of fusion kJ/mol 7 .75

Electronegativity - 0 .89 Specific heat J/gK 0 .204

The oxide is a strong base.
Crystal are body centered cubic.

Electron config. : [Xe] 6s²

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

114
0.43 sec
a/EC,8.900
Xe-110/Cs-114
113.95093 115
0.4 sec
EC,5.800 MeV
Cs-115
114.94771 116
1.35 sec
EC,6.700 MeV
Cs-116
115.94170 117
1.75 sec
EC/ECa/ECp,9.500
Cs-117/I-113/Xe-116
116.93880 118
5.2 sec
EC,11.080 MeV
Cs-118
117.93344 119
5.4 sec
EC/ECp,8.100
Cs-119/Xe-118
118.93107 120
32 sec
EC,5.000 MeV
Cs-120
119.92603

121
29.5 sec
EC/ECp,6.800
Cs-121/Xe-120
120.92452 122
1.95 min
EC,3.800 MeV
Cs-122
121.92023 123
2.7 min
EC,5.500 MeV
Cs-123
122.91884 124
11.9 min
EC,2.646 MeV
Cs-124
123.91508 125
3.5 min
EC,4.600 MeV
Cs-125
124.91465 126
100 min
EC,1.673 MeV
Cs-126
125.91124 127
12.7 min
EC,3.450 MeV
Cs-127
126.91112

128
2.43 da
EC,3.930 MeV
Cs-128
127.90830 129
2.23 hr
EC,2.432 MeV
Cs-129
128.90867 130 0.106%

Stable

129.90631 131
11.50 da
EC,1.370 MeV
Cs-131
130.90693 132 0.101%

Stable

131.90505 133
10.51 yr
EC,5.500 MeV
Cs-133
132.90600 133a
38.9 hr
EC,5.500 MeV
Cs-133
132.90631

134 2.417%

Stable

133.90450 135 6.592%

Stable

134.90568 136 7.854%

Stable

135.90457 137 11.23%

Stable

136.90582 138 71.70%

Stable

137.90524 139
83.06 min
B-,2.317 MeV
La-139
138.90883 140
12.752 da
B-,1.047 MeV
La-140
139.91059

141
18.27 min
B-,3.216 MeV
La-141
140.91441 142
10.6 min
B-,2.212 MeV
La-142
141.91645 143
14.33 sec
B-,4.243 MeV
La-143
142.92061 144
11.5 sec
B-/B-n,3.120
La-144/La-143
143.92294 145
4.31 sec
B-,4.930 MeV
La-145
144.92694 146
2.22 sec
B-,4.120 MeV
La-146
145.93017 147
0.893 sec
B-/B-n,5.750
La-147/La-146
146.93398

148
0.607 sec
B-/B-n,5.120
La-148/La-147
147.93768 149
0.344 sec
B-/B-n,7.300
La-149/La-148
148.94202 150
0.3 sec
B-,6.600 MeV
La-150
149.94557 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.

Atomic number	-	56		Density	g/mL	3	.5
Atomic weight	u	137	.33	Melting point	K	1002
Bonding radius	A	1	.98	Boiling point	K	2171
Atomic radius	A	2	.78	Heat of vaporization	kJ/mol	142
Ionization Potential	V	5	.212	Heat of fusion	kJ/mol	7	.75
Electronegativity	-	0	.89	Specific heat	J/gK	0	.204
The oxide is a strong base.				Crystal are body centered cubic.
Electron config. : [Xe] 6s²
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114 0.43 sec a/EC,8.900 Xe-110/Cs-114 113.95093	115 0.4 sec EC,5.800 MeV Cs-115 114.94771	116 1.35 sec EC,6.700 MeV Cs-116 115.94170	117 1.75 sec EC/ECa/ECp,9.500 Cs-117/I-113/Xe-116 116.93880	118 5.2 sec EC,11.080 MeV Cs-118 117.93344	119 5.4 sec EC/ECp,8.100 Cs-119/Xe-118 118.93107	120 32 sec EC,5.000 MeV Cs-120 119.92603
121 29.5 sec EC/ECp,6.800 Cs-121/Xe-120 120.92452	122 1.95 min EC,3.800 MeV Cs-122 121.92023	123 2.7 min EC,5.500 MeV Cs-123 122.91884	124 11.9 min EC,2.646 MeV Cs-124 123.91508	125 3.5 min EC,4.600 MeV Cs-125 124.91465	126 100 min EC,1.673 MeV Cs-126 125.91124	127 12.7 min EC,3.450 MeV Cs-127 126.91112
128 2.43 da EC,3.930 MeV Cs-128 127.90830	129 2.23 hr EC,2.432 MeV Cs-129 128.90867	130 0.106% Stable 129.90631	131 11.50 da EC,1.370 MeV Cs-131 130.90693	132 0.101% Stable 131.90505	133 10.51 yr EC,5.500 MeV Cs-133 132.90600	133a 38.9 hr EC,5.500 MeV Cs-133 132.90631
134 2.417% Stable 133.90450	135 6.592% Stable 134.90568	136 7.854% Stable 135.90457	137 11.23% Stable 136.90582	138 71.70% Stable 137.90524	139 83.06 min B-,2.317 MeV La-139 138.90883	140 12.752 da B-,1.047 MeV La-140 139.91059
141 18.27 min B-,3.216 MeV La-141 140.91441	142 10.6 min B-,2.212 MeV La-142 141.91645	143 14.33 sec B-,4.243 MeV La-143 142.92061	144 11.5 sec B-/B-n,3.120 La-144/La-143 143.92294	145 4.31 sec B-,4.930 MeV La-145 144.92694	146 2.22 sec B-,4.120 MeV La-146 145.93017	147 0.893 sec B-/B-n,5.750 La-147/La-146 146.93398
148 0.607 sec B-/B-n,5.120 La-148/La-147 147.93768	149 0.344 sec B-/B-n,7.300 La-149/La-148 148.94202	150 0.3 sec B-,6.600 MeV La-150 149.94557	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass