56
Ba
137.33
Barium (Ba)
Element 56 · Period 6 · Group 2
alkaline-earth
solid at room temp
s-block
About Barium
Used in X-ray imaging (barium meals), drilling muds, and green fireworks.
Physical Properties
Atomic Mass
137.33 u
State at 25°C
Solid
Melting Point
727 °C
Boiling Point
1897 °C
Density
3.51 g/cm³
Magnetism
Diamagnetic
Atomic Properties
Electron Configuration
[Xe] 6s²
Electron Shells
2, 8, 18, 18, 8, 2
Electronegativity
0.89
Atomic Radius
253 pm
Ionization Energy
503 kJ/mol
Oxidation States
+2
Discovery & History
Discovered By
Carl Wilhelm Scheele
Discovery Year
1772
Named By
Humphry Davy
Name origin: Greek: barys (heavy)
Frequently Asked Questions
- Is Barium a metal, nonmetal, or metalloid?
- Barium is classified as a alkaline-earth.
- What state is Barium in at room temperature?
- Barium is a solid at standard room temperature (25°C).
- What is the atomic mass of Barium?
- Barium has an atomic mass of 137.33 atomic mass units (u).
- Who discovered Barium?
- Barium was discovered by Carl Wilhelm Scheele in 1772.
- Where is Barium on the periodic table?
- Barium is element number 56, located in period 6 and group 2.