Boron was first discovered by Sir Humphrey Davy, Joseph-Louis Gay-Lussac, Louis Jacques Thénard at 1808 in England, France.
Name: Boron
Symbol: B
Atomic number: 5
Atomic weight: 9.0122
State: solid
Group, period, block: 2, 2, s
Color: white-gray metallic
Classification: alkaline earth metal
Electron configuration: 2s2 2p1
2,3
Physical properties
Density: 2.46 g/cm-3
Melting point: 2349 K, 2076 °C, 3769 °F
Boiling point: 4200 K, 3927 °C, 7101 °F
Atomic properties
Oxidation states: 3, 2, 1[3]
Electronegativity: 2.04 (Pauling scale)
Ionization energies: 1st: 800.6 kJ·mol-1
Covalent radius: 84±3 pm
Van der Waals radius: 192 pm
- B
Electron Configuration
Isotopes
There are two naturally occurring isotopes of boron exist, 10B and 11B.
About 80.1% of the boran in nature is 11B.
About 19.9% of the boran in nature is 10B.