We can represent atoms by listing the number of protons, neutrons, and electrons-for example, 2p+, 2n0, 2e- for helium. Which of the following represents the 18O isotope of oxygen?
A) 7p+, 2n0, 9e-
B) 8p+, 10n0, 8e-
C) 9p+, 9n0, 9e-
D) 10p+, 8n0, 9e-

Question

Quizplus · Accepted Answer

The 18O isotope of oxygen has 8 protons (as all oxygen atoms do), 10 neutrons (to make the mass number 18), and 8 electrons (to balance the 8 positive charges of the protons for a neutral atom).

We Can Represent Atoms by Listing the Number of Protons