Yes, oxygen does have ionization energy. Ionization energy is the energy required to remove an electron from an atom or ion in the gas phase. Oxygen, with its atomic number of 8, has a total of eight electrons. These electrons are distributed in different energy levels or orbitals around the nucleus.
To remove an electron from an oxygen atom, energy must be supplied to overcome the attractive forces between the negatively charged electrons and the positively charged nucleus. The energy required to remove the outermost or valence electron from an oxygen atom is referred to as the first ionization energy of oxygen.
The first ionization energy of oxygen is relatively high compared to some other elements because oxygen has a nearly filled valence shell. Oxygen's electron configuration is 1s²2s²2p⁴, with two electrons in the 2s orbital and four electrons in the 2p orbital. Removing one electron from the 2p orbital requires a significant amount of energy.
The first ionization energy of oxygen is approximately 1314 kilojoules per mole (kJ/mol). This value represents the energy needed to remove one mole of electrons from one mole of oxygen atoms in the gas phase.
It's important to note that ionization energy values can vary depending on the specific experimental conditions and the exact form of the atom or ion being considered.