Chemistry Worrior

By Sohail

     Overview:

                                    LATIN NAME: Helium

                                    Symbol: He

                                    DISCOVERY YEAR: 1895

                                    Atomic Number: 02

                                    Group: 18

                                    Period: 1

                                    Block: s

                                    CAS Number:7440-59-7

 

     ATOMIC PROPERTIES:

                         ATOMIC WEIGHT: 4.002602 g/mol

                           OXIDSTION STATES: 0

                           ELECTRON PER SHELL: K2

                            ELECTRONIC CONFUGRSTION: 1S2

                           GAS ATOMIC MULTIPLES: 01

                           ATOMIC RADIUS,PM: 31 pm

                           COVALENT RADIUS: 32 pm

                           VAN DER WALLS RADIUS: 140 pm

 

      THERMODYNAMIC PROPERTIES:

 

                    Phase: Gas

                   Boiling Point: -268.93 0C

                   Milting Point0C

                   Fusion Heat: 0.02 KJ/mol

                   Specific Heat: 5193 KJ-1.kg-1

                   Vaporization Heat: 0.083 kJ/mol

      MATERIAL PROPERTIES:

                   Color: Colorless

                   Density: 0.1785 kg.m-3

                   Molar Volume: 0.02242 m3.mol-1

                       Refractive Index: 1.000035

                   Sound speed: 970 m.s-1

                   Thermal Conductivity:0.513 W.m-1k-1

 

     ELECTROMAGNETIC PROPERTIES:

 

                   Magnetic Type: Diamagnetic

                   Volume Magnetic Susceptibility: -0.105×10-8

                   Mass Magnetic Susceptibility: -0.59×10-8

                   Molar Magnetic Susceptibility:-0.236×10-11

 

     REACTIVITY:

                   Valence: 0

                   Electron Affinity: 0

                    STABLE

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