📖 what
What is ionization energy?
Quick Answer
Ionization energy is the energy needed to remove an electron from an atom or ion in the gas phase. It measures how tightly an atom holds its electrons.
The Full Story
Elements with high ionization energy, such as helium and neon, resist losing electrons. Elements with low ionization energy, such as alkali metals, lose electrons more easily and are highly reactive. Ionization energy is usually measured in electronvolts or kilojoules per mole. It is one of the periodic trends that helps explain chemical behavior across the table.
Key Facts
1.It is measured for gaseous atoms or ions
2.Helium has one of the highest first ionization energies
3.Alkali metals have relatively low ionization energies
YouTube Angle
Suggested video title for this topic:
"The energy cost of pulling an electron away"
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