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5 - Boron metalloid

Discovered by Joseph Gay-Lussac in 1808

Boron

Boron is a metalloid chemical element with symbol B and atomic number 5. Produced entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a low-abundance element in both the Solar system and the Earth's crust. Boron is concentrated on Earth by the water-solubility of its more common naturally occurring compounds, the borate minerals.

Shell Electrons Orbitals
1 2 2 in 1s
2 3 2 in 2s + 1 in 2p
BoronB Electron 1 Electron 2 Electron 1 Electron 2 Electron 3
10.8  u Atomic Mass
1.2  Å Atomic Radius
4.2k  K Boiling Point
0.84  Å Covalent Radius
2.08  g/cm³ Density
27 Electron Affinity
2.04 Electronegativity
8.3  eV First Ionization Energy
2.57k  K Melting Point
2 Number of Shells
3 Electron Valency
5 Atomic Number
2, 3 Electron Shell Occupations
1.03  J/(g K) Specific Heat