Chemistry Worrior

By Sohail

OVERIEW:

                                    LATIN NAME: Borum

                                    Symbol:B

                                    DISCOVERY YEAR: 1808

                                    Atomic Number: 05

                                    Group: 13

                                    Period: 2

                                    Block: p

                                    CAS Number:7440-42-8

      ATOMIC PROPERTIES:

                         ATOMIC WEIGHT: 10.811 g/mol

                           OXIDATION STATES: +3

                           ELECTRON PER SHELL: K2 L3

                           ELECTRONIC CONFUGRATION: 1S2 2s2 2p1

                           ATOMIC RADIUS,PM: 87 pm

                           COVALENT RADIUS: 82 pm

 

THERMODYNAMIC PROPERTIES:

 

                   Phase: Solid

                   Boiling Point: 4000 0C

                   Milting Point: 2075 0C

                   Fusion Heat: 7.95 KJ/mol

                   Specific Heat: 50 KJ-1.kg-1

                   Thermal Heat Expansion: 0.000006 k-1

                   Vaporization Heat:506 kJ/mol

 

MATERIAL PROPERTIES:

                   Color: Black

                   Bulk Modulus: 320 GPa

                   Density: 2460 kg.m-3

                       Liquid density: 2080 kg.m-3

                   Mohs Hardness: 9.3

                   Vickers Hardness: 49000 MPa

                   Molar Volume: 0.000004395 m3.mol-1

                     Sound speed: 16200 m.s-1

                   Thermal Conductivity: 27 W.m-1k-1

 

     ELECTROMAGNETIC PROPERTIES:

 

                   Magnetic Type: Diamagnetic

                   Electrical Type: Insulator

                   Eectrical conductivity: 0.0001 S.m-1

                   Volume Magnetic Susceptibility: 214×10-4

                   Mass Magnetic Susceptibility: 87×10-7

                   Molar Magnetic Susceptibility:941×10-10

                   Resistivity: 10000 ohm.m

    REACTIVITY:

                   Electronegativity: 2.04

                   Valence: 03

                  Electron Affinity: 26.7 kJ.mol-1

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