Question

In the interactive, start adding neutrons to the nucleus.

What happens to the mass number each time you add a neutron, and why?

Answer 1

The mass increases

Step-by-step explanation:

When protons and neutrons are added, the mass increases. Electrons, on the other hand, are so small they do not affect the mass.

Answer 2

Step-by-step explanation:

Each time you add a neutron, it adds one mass number to the mass because each neutron and proton weighs approximately 1 amu.