![[ATOM]](atom.gif) |
Barium
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Information valid for Ba-137 unless otherwise noted
Basic Information
Symbol: Ba
Atomic Number: 56
Mass: 137.327
Melting Point: 725.0 C
Boiling Point: 1140.0 C
Number of Protons/Electrons: 56
Number of Neutrons: 81
Classification: Alkaline Earth
Crystal Structure: Cubic
Density @ 293 K: 3.51 g/cm3
Color: Silver
Atomic Structure
![[Bohr Model of Barium]](b0056.gif) |
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Number of Energy Levels: 6
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 18
Fifth Energy Level: 8
Sixth Energy Level: 2
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Isotopes
| Isotope |
Half Life |
| Ba-130 |
Stable |
| Ba-131 |
11.7 days |
| Ba-132 |
Stable |
| Ba-133 |
10.5 years |
| Ba-133m |
1.6 days |
| Ba-134 |
Stable |
| Ba-135 |
Stable |
| Ba-135m |
1.2 days |
| Ba-136 |
Stable |
| Ba-137 |
Stable |
| Ba-137m |
2.6 minutes |
| Ba-138 |
Stable |
| Ba-139 |
1.4 hours |
| Ba-140 |
12.8 days |
| Ba-141 |
18.3 minutes |
| Ba-142 |
10.7 minutes |
Facts
Date of Discovery: 1808
Discoverer: Sir Humphrey Davy
Name Origin: From the Greek word barys (heavy)
Uses: No uses known
Obtained From: barytine, whiterite