For an ion, the oxidation number is __.Multiple choice question.one less than the charge on the ionalways negativezerothe same as the charge on the ion

The oxidation number for an element can be based on the number of electrons it needs to  to have a full valence shell. For example, the oxidation number 3- means that the element has  valence electrons and that it will gain  electrons to have a full valence shell. This will cause this element to become a  charged (-3) ion.

The oxidation number for an element is based on the number of   that element has. For example, the oxidation number 2+ means that the element has  electrons that it will donate and, therefore, will become a  charged (+2) ion.

If you add all the oxidation numbers in a polyatomic ion, what should the sum be?A The sum should equal 0.B The sum should equal –1.C The sum should equal –2.D The sum should equal the charge on the ion.

Which of the following is correct regarding the ion shown below?Group of answer choices

Which is the charge that results when oxygen becomes an ion?