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Periodic Table

Picture of  Helium
 
 

 Atomic No. Order:
[Picture]

 Alphabetic Order:
 

Helium  
Ground State Electron Configuration of  Helium
Symbol: He
Atomic Number: 2
Atomicmass: 4.00260 g./mol
Electronegative (According to Pauling): unknown
Density: 0.178 * 10-3 g.cm-3 at 20 °C
Melting Point: - 272.2 (26 atm) °C
Boiling Point: - 268.9 °C
Venderwaals Radius: 0.118
Ionic Radius: nmunknown
Isotopes: 2
Electronic Shell: 1s2
Energy Of First Ionization: 2372 kJ./mol  

2

No of Protons
Standard Potential: Unknown

Electron in Full Shell
Discoverd By: Discovered by Sir Ramsey in 1895

Electron in Partial Shell
   
 
 

 
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