Considering the definition of ion, option A is correct: when an atom that has no charge loses two electrons, it becomes a positive ion or cation.
Definition of ion
An ion is an electrically charged particle that is made up of an atom or molecule that is not electrically neutral, that is, that in its constitution has gained or lost electrons.
In other words, an ion is a molecule or atom that has a positive or negative electrical charge. That is, an ion is an atom whose electrical charge is not neutral.
If the electrical charge is positive, it is called a cation while if the electrical charge is negative, it is called a anion.
This case
Cations are positively charged ions. They are formed as a result of the loss of electrons. This means that cations always have more protons than electrons.
Finally, option A is correct: when an atom that has no charge loses two electrons, it becomes a positive ion or cation.
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