Input interpretation
synthetic elements | first ionization energy
Summary
median | 608 kJ/mol highest | 920 kJ/mol (astatine) lowest | 540 kJ/mol (promethium) distribution | | (based on 13 values; 16 unavailable)
Entities with missing values
lawrencium | rutherfordium | dubnium | seaborgium | bohrium | hassium | meitnerium | darmstadtium | roentgenium | copernicium | ... (total: 16)
Plot
Plot
Periodic table location
Periodic table location
Distribution plots
(first ionization energy in kilojoules per mole)
First ionization energy rankings
1 | promethium | 540 kJ/mol 2 | americium | 578 kJ/mol 3 | curium | 581 kJ/mol 4 | plutonium | 584.7 kJ/mol 5 | berkelium | 601 kJ/mol 6 | neptunium | 604.5 kJ/mol 7 | californium | 608 kJ/mol 8 | einsteinium | 619 kJ/mol 9 | fermium | 627 kJ/mol 10 | mendelevium | 635 kJ/mol 11 | nobelium | 642 kJ/mol 12 | technetium | 702 kJ/mol 13 | astatine | 920 kJ/mol (based on 13 values; 16 unavailable)
Unit conversions for median first ionization energy 608 kJ/mol
0.608 MJ/mol (megajoules per mole)
608000 J/mol (joules per mole)
145 kcal/mol (thermochemical kilocalories per mole)
6.3 eV (molar electronvolts)
Comparisons for median first ionization energy 608 kJ/mol
≈ 0.26 × molar energy required to remove the first electron from helium ( 2372 kJ/mol )
≈ 1.6 × molar energy required to remove the first electron from cesium ( 377 kJ/mol )