Input interpretation
period 1 elements | first molar ionization energy
Results
hydrogen | 1312 kJ/mol (kilojoules per mole) helium | 2372.3 kJ/mol (kilojoules per mole)
period 1 elements | first molar ionization energy | 1842.2 kJ/mol (kilojoules per mole) (median)
Relative values
| visual | ratios | | comparisons hydrogen | | 0.553 | 1 | 44.7% smaller helium | | 1 | 1.8082 | 80.82% larger
Unit conversions for median first molar ionization energy 1842.2 kJ/mol
1.8422 MJ/mol (megajoules per mole)
1.8422×10^6 J/mol (joules per mole)
440.28 kcal/mol (thermochemical kilocalories per mole)
19.093 eV (molar electronvolts)
Comparisons for median first molar ionization energy 1842.2 kJ/mol
≈ 0.78 × molar energy required to remove the first electron from helium ( 2372 kJ/mol )
≈ 4.9 × molar energy required to remove the first electron from cesium ( 377 kJ/mol )