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| abstraction > mathematical concept > number > quantity > energy > ionization potential | 
| ionization potential comparison table | ||
| Subject | is a kind of | has definition | 
|---|---|---|
| energy | quantity | |
| ionization potential | energy | The minimum energy required to remove an electron from an atom. It always takes a higher energy to remove a second electron from a singly ionized atom, a still higher energy to remove a third, etc. The ionization potential for hydrogen is 13.596 eV, which corresponds to a wavelength of 912 Å. | 
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