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Information valid for Be-9 unless otherwise noted

Basic Information

Symbol: Be
Atomic Number: 4
Mass: 9.012182
Melting Point: 1278.0 C
Boiling Point: 2970.0 C
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]
Number of Energy Levels: 2

  1. First Energy Level: 2
    Second Energy Level: 2


Isotope Half Life
Be-7 53.3 days
Be-9 Stable
Be-10 2600000.0 years


Date of Discovery: 1798
Discoverer: Fredrich Wohler
Name Origin: From the mineral beryl
Uses: spacecraft, missiles, aircraft
Obtained From: beryl, chrysoberyl