O III is
A) 4-times-ionized oxygen (an oxygen atom that has lost 4 electrons).
B) doubly ionized oxygen (an oxygen atom that has lost 2 electrons).
C) an oxygen isotope with 3 neutrons.
D) 3-times-ionized oxygen (an oxygen atom that has lost 3 electrons).

Question

Quizplus · Accepted Answer

O III refers to doubly ionized oxygen, meaning an oxygen atom that has lost two electrons. The Roman numeral III indicates the charge of the ion, not the number of electrons lost, which in this case is +2, hence two electrons have been removed.

O III Is