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Basic Information
Name: Beryllium
Symbol: Be
Atomic Number: 4
Atomic Mass: 9.012182 amu
Melting Point: 1278.0 °C (1551.15 °K, 2332.4 °F)
Boiling Point: 2970.0 °C (3243.15 °K, 5378.0 °F)
Number of Protons/Electrons: 4
Number of Neutrons: 5
Classification: Alkaline Earth
Crystal Structure: Hexagonal
Density @ 293 K: 1.8477 g/cm3
Color: gray
Atomic Structure
![[Bohr Model of Beryllium]](Chemical Elements_com - Beryllium (Be)_files/b0004.gif) |
Number of Energy Levels: 2 First Energy Level: 2 Second Energy Level: 2 |
Isotopes
| Isotope | Half Life |
| Be-7 | 53.3 days |
| Be-9 | Stable |
| Be-10 | 2600000.0 years |
Facts
Date of Discovery: 1798
Discoverer: Fredrich Wohler
Name Origin: From the mineral beryl
Uses: spacecraft, missiles, aircraft
Obtained From: beryl, chrysoberyl