हीलियम तत्व के बारे में जानकारी (Information about helium element)
Helium
• Atomic number → 2
• Atomic radius [pm] → 31
• Boiling point [°C] → -266.934
• Covalent radius [pm] → 32
• Critical point [°C] → -267.96
• Critical pressure [MPa] → 0.227
• Density [g/cm3] → 0.0001785
• Discovery → 1868
• Electron configuration → 1s2
• Element category → Noble gases
• Group → VIII.A
• Heat capacity [J K-1g-1] → 5.193
• Latin name → Helium
• Melting point [°C] → -272.12
• Period → 1
• Relative atomic mass → 4.002602
• Stable isotopes → 2
• State → Gas
• Symbol → He
• Thermal conductivity [W m-1K-1] → 0.152
• Unstable isotopes → 2
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