Periodic System for Chemists

Your periodic table, always with you.

Use it offline. Find elements quickly. Keep favorites and personal notes on iPhone and iPad.

Back to Helium

Helium Electron Affinity

He - Atomic Number 2

Electron Affinity
-19.7 eV
Ranking:
#77 of 77
Highest
Cl: 3.61
Lowest
He: -19.70

About the Electron Affinity

Energy change when an electron is added to a neutral atom.

Top 10 by Electron Affinity

Unit Conversions

eV -19.700
kJ/mol -1900.75
kcal/mol -454.30

Top 10 by Electron Affinity

#1 Cl Chlorine
3.61 eV
#2 F Fluorine
3.40 eV
#3 Br Bromine
3.36 eV
#4 I Iodine
3.06 eV
#5 At Astatine
2.80 eV
#6 Au Gold
2.31 eV
#7 Pt Platinum
2.13 eV
#8 S Sulfur
2.08 eV
#9 Se Selenium
2.02 eV
#10 Te Tellurium
1.97 eV

iPhone & iPad

Your periodic table, always with you.

  • Access element data offline, in the lab or in class.
  • Find elements quickly by name, symbol, or atomic number.
  • Save favorite elements and add your own notes.
Published App Store screenshots: periodic table, element details, and search (English).