If an isotope of oxygen has 8 protons,10 neutrons,and 8 electrons,its mass number is
A)26.
B)16.
C)18.
D)8)
E)12.

Question

Quizplus · Accepted Answer

The mass number of an atom is the sum of its protons and neutrons. In this case, the oxygen isotope has 8 protons and 10 neutrons, giving a total of 18 nucleons. As the atomic number (number of protons) of oxygen is 8, the oxygen isotope in question is Oxygen-18 (18O), with a mass number of 18. Therefore, the correct answer is C.

If an Isotope of Oxygen Has 8 Protons,10 Neutrons,and 8