The ionization energy of an atom is the energy:

needed to add electron to an atom.

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needed to transfer an electron from one orbit to another.

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needed to convert the atom into radioactive isotope.

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just enough to cause an electron to escape from the atom.

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Solution

The correct option is D
just enough to cause an electron to escape from the atom.

Ionization energy is defined as the energy required to remove the outer most valence electrons is called as ionization energy.

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The ionization energy of an atom is the energy:

The correct option is D just enough to cause an electron to escape from the atom. Ionization energy is defined as the energy required to remove the outer most valence electrons is called as ionization energy.

The correct option is D
just enough to cause an electron to escape from the atom.

Ionization energy is defined as the energy required to remove the outer most valence electrons is called as ionization energy.