beryllium

      4. Beryllium

Topic covered :-

 Beryllium

 Beryllium gas

Wikipedia beryllium

Details of beryllium

   

• Symbol:

     Be

• Latin name:

     Beryllium

• English name:

     Beryllium

• Year discovered:

      1798

• Discovered by:

      Louis-Nicolas Vauquelin

                                         Image

Image source - Google | Photo by image of elements 

• Electron shell:

     K2 L2 M0 N0 O0 P0 Q0 R0

• Electrons:4
• Protons:4
• Neutrons:5

• Atomic number:

    4

• Atomic weight (Relative atomic mass):

      9.0121(g/mol)

• Density:

     1.848 (g/cm³) (g/cm³)

• Melting point:

     1278.0°C   =   2332.4°F   =   1551.15K

• Boiling point:

     2970.0°C   =   5378.0°F   =   3243.15K

• Phase:

     Solid

• Valence:

     II

• Period:

     2

• Group:

    IIA

• Block:

     s - block

• Electron configuration:

      [He]2s2
      1s2 2s2

• Oxidation states:

    +1,+2

• Ion charge:

     Be2+

• The ionisation potential of an atom:

     9.50 (eV)

• Atomic radius:

     112 (pm)

• Covalent radius:

     90 (pm)

• Van der Waals radius:

    153 (pm)

• Electronegativity:

    1.57

• Valence:

     II

• Electrical type:

     Conductor

• Electrical conductivity:

      2.5 ⋅ 107 (S/m)

• Magnetic type:

     Diamagnetism

• Resistivity:

     4 ⋅ 10-8 (mΩ)

• Crystal structure:

    Hexagonal close-packed

• Grid parameters:

     a=2.286 Å; c=3.584 Å

• Attitude c/a :

     1.567