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Which element has the highest ionization energy?
ChemistryAtomic Structure
Quick Answer
Helium has the highest first ionization energy of any element, about 24.6 electron volts. It is very difficult to remove an electron from a helium atom.
The Full Story
Helium has the highest first ionization energy because its electrons are held very tightly by its small nucleus and compact electron cloud. The value is about 24.6 eV, higher than any other element. This means helium resists forming positive ions much more strongly than most atoms. The property helps explain why helium is so chemically inert and is used in environments where nonreactive gases are needed.
Key Facts
1.Helium ionization energy: about 24.6 eV
2.Atomic number: 2
3.Very inert noble gas
YouTube Angle
Suggested video title for this topic:
"The atom that refuses to lose an electron"