हीलियम तत्व के बारे में जानकारी (Information about helium element)


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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