The atomic mass number of a nucleus is equivalent to which of the following numbers?
A)number of neutrons present
B)number of protons present
C)difference in neutron and proton numbers
D)sum of neutron and proton numbers

Question

Quizplus · Accepted Answer

The atomic mass number (sometimes referred to as the mass number) is the sum of the number of protons and neutrons present in the nucleus of an atom. Therefore, the correct answer is D, the sum of neutron and proton numbers.

The Atomic Mass Number of a Nucleus Is Equivalent to Which