Elements With the Highest First Ionization Energy
Key Findings
🏆
Helium leads in First Ionization Energy (kJ/mol) with 2,372.30.
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Average First Ionization Energy (kJ/mol): 1,546 · median: 1,377.
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Gap: Helium is 2× larger than Xenon.
About This Dataset
Elements With the Highest First Ionization Energy
This chart ranks elements by first ionization energy, the energy in kilojoules per mole needed to remove one electron from a neutral gaseous atom. Higher values mean the atom holds its electrons more tightly. Helium leads.
Analysis
Helium heads the table on 2,372.3, ahead of Neon (2,080.7) and Fluorine (1,681) in First Ionization Energy (kJ/mol). 1,201.9 separates the highest figure (2,372.3) from the lowest (1,170.4). First and second are separated by 291.6, so the leader sits inside the field rather than apart from it. Places 3 to 10 are close together, spanning 1,681 to 1,170.4.
Data Insights
Numbers, trends & sources behind this chart
Methodology & source
- Data source
- Ionization energies of the elements
- Coverage
- 10 entities · 10 observations
- Measure
- First Ionization Energy (kJ/mol)
- Last updated
- 16 September 2026
- Compiled by
- The ANYSTAT team, from the source above
How the figures are calculated
- Values are shown as reported by the source. Nothing is rescaled, rebased or converted — the only changes are thousand separators and decimals shown to two places.
- Entities are ranked highest-first on their value.
Data Sources & References
All external sources cited in this dataset
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