←Li   Be↑   ↓Mg   B→

Beryllium ∙ béryllium ∙ berillio ∙ berilio
group II: RO

• melting point: 1287°C
• boiling point: 2472°C
• density: 1.848 g/cm³

A pure Beryllium tuning fork can be heard in this video! — youtube

⚒ minerals:
Beryl Be₃Al₂Si₆O₁₈

⁷Be is a tracer for stratospheric and upper tropospheric air — e.g. here

☢ radioisotopes:
Be-7 (T1/2=53.2 d) cosmogenic
Be-10 (T1/2=1.4 mio a) cosmogenic

Be-10 from sediment cores has been used as a proxy for solar activity — e.g. here