If two different nuclides have the same mass number,it must mean that
A)the combined number of protons and neutrons are the same.
B)both have the same number of neutrons.
C)both have the same number of electrons.
D)both have the same number of protons.
E)they are isotopes.

Question

Quizplus · Accepted Answer

Mass number is defined as the combined number of protons and neutrons in a nucleus. Therefore, if two different nuclides have the same mass number, it must mean that their combined number of protons and neutrons are the same. They may or may not have the same number of protons or neutrons individually.

If Two Different Nuclides Have the Same Mass Number,it Must