Atomic Number
4
Beryllium is a relatively rare element in the universe. It is a divalent element which occurs naturally only in combination with other elements to form minerals.
4
9.0122 u
alkaline earth
solid
1.85 g/cm³
2, 2
Protons: 4 • Electrons: 4 • Neutrons: Varies by isotope
Electron Configuration: 1s² 2s²
1798 • Louis Nicolas Vauquelin