Latin Name:
Borum
English Name:
Boron
Year discovered:
1808
Discovered by:
Joseph Louis Gay-Lussac
Louis Jacques Thénard
Humphry Davy
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Electron shell:
K2 L3 M0 N0 O0 P0 Q0 R0
Electrons:5
Protons:5
Neutrons:6
Atomic number:
5
Atomic weight (Relative atomic mass):
10.811(g/mol)
Density:
2.34 (g/cm³) (g/cm³)
Melting point:
2075.8°C = 3768.44°F = 2348.95K
Boiling point:
3926.8°C = 7100.24°F = 4199.95K
Phase:
Solid
Valence:
III
Period:
2
Group:
IIIA
Block:
p - block
Oxidation states:
-3,-1,+1,+2,+3
The ionisation potential of an atom:
8.33 (eV)
Atomic radius:
98 (pm)
Covalent radius:
82 (pm)
Van der Waals radius:
192 (pm)
Electronegativity:
2.04
Electron affinity:
26.7 (kJ/mole)
Electrical conductivity:
0.0001 (S/m)
Electrical type:
Dielectric
Magnetic type:
Diamagnetism
Crystal structure:
Rhombohedral
Grid parameters:
a=10.17; α=65.18 Å
Attitude c/a :
0.576
Debye temperature:
976.85°C = 1790.33°F = 1250.0K
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