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Why does neon have a very high ionization energy?

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Because they have stable, filled shell configurations, it is difficult to remove an electron from any of the noble gases. The chart below shows ionization energy through the periodic table. Each peak is one of the noble gases. read more

Neon is a noble gas, so its outer most shell is full with all of its eight electron. These electrons have very much attraction towards nucleus i.e.,it is very hard to remove electron from neon. read more

Hence, it is very difficult to remove an electron from the outermost shell of Neon atom and hence Neon has higher ionisation energy than oxygen which has an electronic configuration of 1s2 2s2 2p4, with two unpaired electrons. read more

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University Of Illinois
butane.chem.uiuc.edu