5
B
10.81
Boron
Element 5 · 10.81 u · p-block
metalloid
A metalloid essential for plant growth. Used in fiberglass, ceramics, and as a neutron absorber in nuclear reactors.
Phase (STP)
Solid
Melting Point
2076 °C
Boiling Point
3927 °C
Density
2.34 g/cm³
Electronegativity
2.04
Atomic Radius
85 pm
Ionization Energy
801 kJ/mol
Electron Affinity
27 kJ/mol
Discovered
1808 · Joseph Louis Gay-Lussac
Electron Configuration
[He] 2s2 2p1
Electron Orbitals
Drag to rotate · Pinch to zoom