4
Be
9.0122
Beryllium (Be)
Element 4 · Period 2 · Group 2
alkaline-earth
solid at room temp
s-block
About Beryllium
Light, stiff metal. Used in aerospace and X-ray windows. Highly toxic.
Physical Properties
Atomic Mass
9.0122 u
State at 25°C
Solid
Melting Point
1287 °C
Boiling Point
2469 °C
Density
1.85 g/cm³
Magnetism
Diamagnetic
Atomic Properties
Electron Configuration
[He] 2s²
Electron Shells
2, 2
Electronegativity
1.57
Atomic Radius
112 pm
Ionization Energy
900 kJ/mol
Oxidation States
+2
Discovery & History
Discovered By
Louis Nicolas Vauquelin
Discovery Year
1798
Named By
Louis Nicolas Vauquelin
Name origin: Greek: beryllos (beryl)
Frequently Asked Questions
- Is Beryllium a metal, nonmetal, or metalloid?
- Beryllium is classified as a alkaline-earth.
- What state is Beryllium in at room temperature?
- Beryllium is a solid at standard room temperature (25°C).
- What is the atomic mass of Beryllium?
- Beryllium has an atomic mass of 9.0122 atomic mass units (u).
- Who discovered Beryllium?
- Beryllium was discovered by Louis Nicolas Vauquelin in 1798.
- Where is Beryllium on the periodic table?
- Beryllium is element number 4, located in period 2 and group 2.