Chemists often represent the structure of atoms using p,n,and e to indicate the numbers of protons,neutrons,and electrons; which atom would have an atomic mass number of 30?
A) 10 p, 10 n, 10 e
B) 15 p, 15 n, 15 e
C) 15 p, 0 n, 15 e
D) 0 p, 15 n, 15 e

Question

Quizplus · Accepted Answer

The atomic mass number of an atom is the sum of its protons and neutrons. Choice B has 15 protons and 15 neutrons, so its atomic mass number would be 30. Choices A, C, and D do not have a total of 30 protons and neutrons.

Chemists Often Represent the Structure of Atoms Using P,n,and E