The periodic table . Highest IE elements
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Helium is the element with the highest ionization energy.
It is a noble gas with a full octet and is stable. It requires a large amount of energy to remove an electron from helium atom.
The valence electrons in He are in K shell which lies very close to the nucleus of the atom. Therefore, it requires more energy to remove an electron
from K shell than any other shell.
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Ionization energy refers to the amount of energy needed to remove an electron from an atom. Ionization energy decreases as we go down a group. Ionization energy increases from left to right across the periodic table.
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