Question

When oxygen molecule will become
oxygen ions?​

Answer 1

Electrochemical reduction of oxygen from the gas phase to oxide ions consumes two electrons (Reaction 4.4). The oxygen ions formed by reduction are then incorporated into the electrolyte, through oxygen vacancies, and migrate to the anode.

Answer 2

When an oxygen molecule will gain two electrons it forms an oxygen ion.

Explanation:

• Oxygen atomic number 8 and electronic configuration(2,6)
• It needs to gain two-electron to fill the energy level and to obtain the octet of electrons in the outermost shell.
• The oxide ion will be having a charge of 2- due to the gain of two electrons.
• The ion will have a charge which is equal to the difference in the number of electrons and protons.
• The number of electrons is the parent atom gains or lost.
• It is an electrically neutral oxygen atom that gains two electrons in order to form oxygen ions with negative charges.