boron

5.Boron

B(0.811 g/mol)


Topic covered :-

Boron
Boron gas
Boron atom
Wikipedia boron
Details of boron

Latin Name:

 Borum


English Name:

Boron


Year discovered:

1808


Discovered by:

Joseph Louis Gay-Lussac

Louis Jacques Thénard

Humphry Davy


Image

Boron
Image source - Google | Photo by image of elements 


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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